taxonID	type	description	language	source
03AA7235FFB2FF98FF01FE018650FAE4.taxon	description	Figure 5	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFB2FF98FF01FE018650FAE4.taxon	description	Cryptophyte, native with wide distribution in the American continent. Least Concern (Delucchi 2006). Characteristics. Delicate fern; rhizomes cylindrical, covered with brown-yellowish scales. Fronds triangular, pinnately compound, glabrous, with a thin, cylindrical, dark, almost black, glossy petiole. Pinnules alternate, irregular, almost rhombic; apex incised, with base cuneate, veins dichotomous; petioles long, thread-like. Sorus located on edge of pinnules.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFB2FF98FF01FE018650FAE4.taxon	discussion	Comments. This is a rare species in the study area. This fern grows in shady, humid sites. At the summit, it grows in deep cracks of rocks and also along the shaded banks of the stream. The major difference between A. raddianum and A. chilense Kaulfuss, which is also frequent in Buenos Aires mountains, is in the shape of the pinnules; the latter species presents reniform pinnules without cuneate bases and with the upper margin entire or with short incisions. Subclass Magnoliidae Superorder Lilianae Order Asparagales: Family Amaryllidaceae: Tribe Gilliesiae	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFB2FF98FF01FA098216FA49.taxon	description	Figure 6	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFB2FF98FF01FA098216FA49.taxon	description	(1898): 312 — Guaglianone (1972): 159 – 242.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFB2FF98FF01FA098216FA49.taxon	description	Characteristics. Perennial herb to 25 cm tall. Bulb subglobose, 1.5 cm in diameter, with onion odor, without lateral rhizomes. Leaves linear, 1 – 3 cm long, veins parallel, apex obtuse, 4 – 18 cm long. Peduncles longer than foliage. Inflorescence: an umbel, with 2 – 5 flowers, with erect, unequal pedicels; rotate perianth with 6 white tepals with purplish tinge; free filaments. Fruit: a capsule.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFB2FF98FF01FA098216FA49.taxon	discussion	Comments. This is a rare species in the study area. It grows in full sunlight conditions on shallow to moderately deep, damp soils on rocky and grassy slopes with other small to medium-sized species. Nothoscordum gaudichaudianum can be distinguished from other Nothoscordum species by its erect peduncles, white tepals, free filaments, and bulbs with characteristic onion odor.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFB2FF99FC84FA6785AEFA07.taxon	description	Figure 7	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFB2FF99FC84FA6785AEFA07.taxon	description	Characteristics. Perennial herb, 5 – 10 cm tall. Bulb solitary, globose, ca 1 cm in diameter. Sheaths short. Leaves to 10 cm long, parallel-veined, linear, with apex acute. Peduncles erect. Inflorescence: an umbel, with 2 – 10 flowers. Tepal perianth yellow, 3.5 – 5 mm long. Anthers to 2 mm long. Fruit: a capsule.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFB2FF99FC84FA6785AEFA07.taxon	discussion	Comments. This is an infrequent species in the study area. It grows in shallow to moderately deep, damp soils on rocky and grassy slopes with other white-flowered Nothoscordum species. Cabrera (1968) reported N. montevidense from Buenos Aires province but not this subspecies. Hurrell (2009 b) reported the existence of 3 subspecies in the Rioplatense region of northwestern Buenos Aires province. Our Paititi specimens belong to N. montevidensis ssp. latitepalum because they are relatively tall and present flowers with wide yellow tepals.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFB3FF99FF01F9B382D2FCFF.taxon	description	Figure 8	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFB3FF99FF01F9B382D2FCFF.taxon	description	Characteristics. Perennial herb. Bulbs subglobose. Peduncles erect, branched, to 1 m tall. Basal leaves scarce, linear in shape, parallel-veined, folded, to 35 cm long, 2.5 cm wide. Inflorescence: a cyme (rhipidium); bracts unequal, with 1 – 2 flowers; tepals orange-brown, filaments free, styles entire. Fruit: a capsule.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFB3FF99FF01F9B382D2FCFF.taxon	discussion	Comments. This is a rare species in the study area. It grows in full sunlight conditions in rock cracks on slopes. It is very similar to C. herbertii ssp. herbertii, but this last species presents vivid orange tepals and united filaments.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFB3FF9AFC84FC7B86C7FC1A.taxon	description	Figure 9	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFB3FF9AFC84FC7B86C7FC1A.taxon	description	Characteristics. Perennial bulbous herb, to 80 cm tall. Basal leaves linear, ca 25 cm long, 3 cm wide, sword- shaped, folded, parallel-veined, semi-coreaceus; superior leaves scarce. Inflorescence: a cyme with 1 – 3 flowers; tepals blue with dark spots at base. Fruit: a capsule.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFB3FF9AFC84FC7B86C7FC1A.taxon	discussion	Comments. This is an infrequent species in the study area. It grows in full sunlight conditions and deep to moderate deep soils on rocky and grassy slopes. Gelasine elongate is the only species of its genus known from Buenos Aires province, and it can be recognized by its folded leaves and blue tepals.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFB0FF9AFF01F84B822BF887.taxon	description	Bipinnula pennicillata (Rchb. f.) Cisternas & Salazar ex Cisternas et al. (2012): 10 — Flora Argentina (2017); Tropicos (2017).	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFB0FF9AFF01F84B822BF887.taxon	description	Chloraea pennicillata Reichenbach. f. (1878): 51. Cryptophyte, native with distribution in the Southern Cone Region of South America. Vulnerable due to restricted habitat (Delucchi 2006). Characteristics. Terrestrial herb, to 30 cm tall including inflorescence. Roots narrow, also tuberous roots. Basal leaves 3 or 4, with elliptic- to ovate-lanceolate in shape, to 10 cm long, larger than caulinar leaves. Inflor- ence 1 - flowered, exceptionally 2 - flowered; flower pale green, with reticulate dark green veins and an insectlike labellum with a darker, blackish-brown, apical part; labellum sessile, smooth, shiny, greenish, convex, its basal part covered by short, slender, retrorse, pale green hairs; central disk with 6 or 7 naked ridges; apex covered with short, clavate, blackish-brown and yellow appendices. Fruit: a capsule.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFB0FF9AFF01F84B822BF887.taxon	discussion	Comments. This is an infrequent species in the study area. It grows in full sunlight conditions in shallow soils on grassland slopes and on summits. Bipinnula pennicillata can be recognized from other Orchidaceae by its 1 - flowered inflorescence and its large flowers with rhom- bic, succulent labellum and sepals without appendices.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFB0FF9BFC84F8D786B7FDC7.taxon	description	Figure 12 Chloraea membranacea Lindley (1840): 401 — Cabrera (1968): 588; Hurrell (2009 a): 344; Flora Argentina (2017); Tropicos (2017). Cryptophyte, native with distribution in the Southern Cone Region of South America. Characteristics. Terrestrial herb, 40 – 70 cm tall, including inflorescence, with folded, fleshy roots. Basal leaves 5 or 6, elliptic in shape, to 15 cm long, with subacute apex. Inflorescence: a raceme; flowers greenish-white; labellum margin entire or slightly trilobed, covered by cilindrical, capitated, darker, blackish-brown to black appendices. Stamens with anthers inclined. Fruit: a capsule.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFB0FF9BFC84F8D786B7FDC7.taxon	discussion	Comments. This is a rare species in the study area. It grows in damp soils, in shady places under trees. Chloraea membranacea is the only species of Chloraea known from Buenos Aires province and is distinguished from other Orchidaceae by its folded, thickened, fleshy roots, and its inclined anthers.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFB1FF9BFF01F9B58423F983.taxon	description	Figure 14	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFB1FF9BFF01F9B58423F983.taxon	description	Characteristics: Annual herb, 5 – 50 cm tall. Leaves linear, parallel-veined, to 10 cm long, green, glabrous, with membranaceous ligule. Inflorescence: a spike-like panicle, to 8 cm long, with many 1 - flowered spikelets, ca 3 mm long; glumes unequal; lemma with 4.5 – 6 mm long awns; palea absent. Fruit: a fusiform caryopsis.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFB1FF9BFF01F9B58423F983.taxon	discussion	Comments. This is an infrequent species in the study area. It grows in shallow soils and rock cracks on the sum- mits. It is similar to Bromidium hygrometricum (Ness) Ness & Meyen, which also has been found in Buenos Aires province, but B. hygrometricum has a glabrous lemma.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFB1FF9BFF01FD7C863FFA1E.taxon	description	Figure 13	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFB1FF9BFF01FD7C863FFA1E.taxon	description	Epiphyte, native with distribution in the Southern Cone Region of South America. Vulnerable for reasons unknown (Delucchi 2006). Characteristics. Perennial plant, to 30 cm tall, with branched roots, and stems covered with sheathed leaves. Leaves lanceolate, forming rosettes, covered with grey scales. Peduncles short, with bracts. Inflorescence: a spike with 6 – 10 flowers, 25 – 30 mm long; floral bracts and sepals green to pink; petals blue. Fruit: capsule.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFB1FF9BFF01FD7C863FFA1E.taxon	discussion	Comments. This is an infrequent species in the study area. It grows in full sunlight conditions in cracks of rocks on summits, where it forms hanging clumps. It is the only species of the genus that has been found in the Tandilia mountain range system. It is the only lithomorphic species found in rocky outcrops and presents dense roots and leaves, multiflorous spikes and green to pink floral bracts and sepals, not reddish like T. aëranthos (Loisel) L. B. Smith.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFB1FF84FC84F9308645FA27.taxon	description	Figure 15 Danthonia montevidensis Hack. & Arechav. (1896): 369 — Zuloaga et al. (2012 a): 229; Flora Argentina (2017); Tropicos (2017). Hemicryptophyte, native with distribution in the Southern Cone Region of South America; previously known from Buenos Aires province but not from mountainous areas. Available information is inadequate to make a direct or indirect assessment of its risk of extinction (Data Deficient) (Delucchi 2006). Characteristics: Perennial, caespitose species herbs, 15 – 60 cm tall. Young leaves are folded to rolled. Leaves parallel-veined, green, glabrous, to 30 cm long. Inflores- cence: a loose pubescence panicle, to 15 cm long, with multiflorous lanceolate spikelets. Glumes 16 – 30 mm long, outgrowing flower sets. Spikelets with 5 – 10 flow- ers; lemma 2.5 – 4 mm long, ovate-lanceolate, with bifid apex. Central twisted awn brown or colorless, 15 – 23 cm long, inserted at bifurcation point of lemma. Fruit: an obovate caryopsis.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFB1FF84FC84F9308645FA27.taxon	discussion	Comments. This is a frequent species in the study area. It grows in shallow to moderately deep soils on slopes, in grasslands, and around the pond. It is similar to Danthonia cirrata Hack. & Arechav., which also has been found in the Paititi Reserve, but the lemma of the latter species has the lateral lobes longer than the undivided part.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFAEFF84FC84FAEB84DFF7A6.taxon	description	Figure 17	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFAEFF84FC84FAEB84DFF7A6.taxon	description	Cryptophyte, native with distribution in the Southern Cone Region of South America. Vulnerable, reasons unknown (Delucchi 2006). Characteristics. Perennial, caespitose species, with erect to slightly stretched culms, up to 30 to 50 cm tall, with roots on basal nodes. Leaves parallel-veined, folded to convolute, green, pubescent, up to 15 cm long, with retrorse hairs and membranous ligule. Inflorescence: a linear, loose panicle with white, compressed, multiflorous spikelets; glumes unequal; lemma papery with retrorse hairs and palea with glabrous lower surface. Fruit: an elliptic caryopsis.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFAEFF84FC84FAEB84DFF7A6.taxon	discussion	Comments. This is a frequent species in the study area. It grows in shallow to moderately deep soils and in rock cracks on summits and on rocky and grassy slopes. It is similar to M. rigida, which has also been found in the Paititi Reserve, but M. rigida has glabrous abaxial leaf surface.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFAEFF84FF01F9868271FAA0.taxon	description	Figure 16	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFAEFF84FF01F9868271FAA0.taxon	description	Cryptophyte, native with distribution in the Southern Cone Region of South America. Characteristics. Perennial, caespitose species, 20 – 80 cm tall, with short rhizomes and erect culms. Young leaves are folded to rolled. Leaves parallel-veined, green, glabrous to hispid, to 9 cm long. Inflorescence: a linear, loose panicle, white with purplish tinge, compressed, multiflorous spikelets, to 11 mm long; glumes unequal; lemma papery with retrorse hairs; palea with glabrous lower surface. Fruit: an elliptic caryopsis.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFAEFF84FF01F9868271FAA0.taxon	discussion	Comments. This is a frequent species in the study area. It grows in shallow to moderately deep soils and in rock cracks on the summits and on rocky or grassy slopes. It is similar to M. brasiliana Ard. However, the latter species presents 11 – 17 mm long spikelets, which are longer than in M. rigida (Torres 1980, Zuloaga 2012 b).	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFAFFF85FF01F8E284E7FC3C.taxon	description	Figure 19	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFAFFF85FF01F8E284E7FC3C.taxon	description	Characteristics. Small shrubs covered with grey scales and with many creeping reddish branches. Leaves bipinnate, 0.3 – 1.5 cm long, with 1 pair of pinnae; leaflets imbricated, grey, 1 – 4 mm long, with stellate hairs. Inflorescence dense and globose, to 2 cm long, with yel- low actinomorphic flowers. Fruits tomentose, with pale brown loments that break apart at 1 – 4 constrictions.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFAFFF85FF01F8E284E7FC3C.taxon	discussion	Comments. This is an infrequent species in the study area. It grows in full sunlight conditions in cracks of rocks on the summits. In the mountains of the area, M. tandilensis Speg. can also be found but differs from M. rocae by presenting prickles on the stems and purplish pink flowers.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFAFFF85FF01FC658621F96B.taxon	description	Figure 18	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFAFFF85FF01FC658621F96B.taxon	description	Poa lanigera Nees var. tandilensis Hackel (1911): 152. Cryptophytes, endemic to mountain ranges of Buenos Aires province. Vulnerable for reasons unknown (Delucchi 2006). Characteristics. Dioecious, perennial, caespitose species, to 1 m tall, with erect, 1 - or 2 - node culms. Leaves parallel-veined, conduplicate, coriaceous, glaucous to glaucous-green, with rough margins and midribs. Basal innovations flabellate, leaf-sheaths compressed. Leaves plane, with a hooded apex, to 50 cm long; ligule membranous. Inflorescence: a compact panicle, to 20 cm long; female and male florets similar, multiflorous, pubescent, 3.5 – 6 mm long. Fruit: a fusiform caryopsis.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFAFFF85FF01FC658621F96B.taxon	discussion	Comments. This is an infrequent species in the study area. It grows in shallow soils and in rock cracks on slopes and summits. It can be differentiated from other Poa species of the area by its caespitose, glaucouse foliage and by its conduplicate leaves with flabellate basal innovations, as in several Iris species. Superorder Rosanae	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFAFFF86FC84FB9686E9FB8E.taxon	description	Figure 20	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFAFFF86FC84FB9686E9FB8E.taxon	description	Cryptophytes; native with distribution in the Southern Cone Region of South America. Characteristics. Perennial twining herb that turns black when it dries. Rhizomes and decumbent tetragone stems with 2 wings in upper stems. Leaves sessile or subsessile, pinnately compound, with 2 oval, slightly glaucous, mucronate leaflets with notable veins, 1 – 7 ter- minal tendrils, and wide sagittate stipules. Inflorescence: a raceme with 5 – 10 flowers of lilac to violet petals. Fruit: a linear and erect legume, which turns black at maturity.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFAFFF86FC84FB9686E9FB8E.taxon	discussion	Comments. This is a frequent species in the study area. It grows in intermediate to full sunlight, on slopes with moderately deep, damp soils. Many species of the genus Lathyrus thrive in the mountain ranges of this region. Lathyrus hookeri can be recognized by the presence of very short petioles (or even sessile leaves) and by its fruit that turns black when dried. In the Paititi Reserve, specimens with violet petals were found, which is typical, and specimens with white petals were also found that, according to Cabrera (1967), would correspond to L. hookeri Don f. albiflora (O. Kuntze) Burkart. Nowadays, L. hookeri f. albiflora is synonym of L. hookeri Don (Flora Argentina 2017). Besides the white flower specimens, plants with white keel and violet standard and wings were also found. This would be the first record of this variant of L. hookeri.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFACFF86FF01FBA78502F968.taxon	description	Figure 21 Lathyrus pusillus Elliot (1823): 223 — Flora Argentina (2017); Tropicos (2017). Lathyrus crassipes Gillies, ex Hook. & Arn. (1830): 198 — Cabrera (1967): 609. Therophytes, native with wide distribution in the American continent; previously recorded from Buenos Aires province but not from mountainous areas. Characteristics. Annual twining herb, to 50 cm tall. A glabrous plant with short-winged stems. Leaves pinnately compond, with 2 linear leaflets and a terminal tendril, split into 1 – 3 segments; petiole 0.5 – 1.5 cm long, stipules sagittate. Inflorescence: racemes, with 1 – 3 flow- ers, with glabrous sepals and white to blue petals. Fruit: a linear and erect legume, turning brown at maturity.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFACFF86FF01FBA78502F968.taxon	discussion	Comments. This is an infrequent species in the study area. It grows in intermediate to full sunlight on slopes with moderately deep, moist soils. Lathyrus pusillus can be recognized from the many other Lathyrus species in the region by the presence of sagittate stipules and brown legumes that do not turn black when dry.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFACFF86FF01F88B82D2F83A.taxon	description	Figure 22 Vicia linearifolia Hooker & Arnott (1830): 20 — Cabrera (1967): 588; Flora Argentina (2017). Therophytes, native with distribution in the Southern Cone Region of South America; previously recorded from Buenos Aires province but not from mountainous areas. Characteristics. Annual, delicate, twining herb, 20 – 40 cm tall, glabrous, with narrow, angular stems. Leaves pubescent, pinnately compound, with 3 – 5 linear to filiform pairs of leaflets, 0.2 – 3 mm wide; with a termi- nal, simple tendril, split into 1 – 3 segments; petiole short or even absent; stipules semi-sagittate, with a spur. Flowers solitary in axils of stems, exceptionally in a terminal, 2 - flowered cyme; corollas pale blue to blue. Fruit: an erect or pendent, pubescent, brown legume.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFACFF86FF01F88B82D2F83A.taxon	discussion	Comments. This is an infrequent species in the study area. It grows in shady sites under trees in damp soils on slopes. It differs from other Vicia species by the presence of solitary flowers (exceptionally 2) that are up to 4 mm long.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFACFF87FC84F868856FFA79.taxon	description	Figure 23	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFACFF87FC84F868856FFA79.taxon	description	Characteristics. Perennial rhizomatous twining herb. Stems pubescent, ascendent, 40 – 80 cm high, angulate to bi-winged. Leaves pubescent, pinnately compound, with 3 – 5 linear-lanceolate to oblong pairs of leaflets, with a terminal tendril, split into 1 – 3 segments; petiole short; stipules semi-sagittate, with acute apex and a spur. Inflo- rescence: a raceme with 4 – 8 flowers, with blue-violet corolla and pubescent, dentate calyx. Fruit: a compressed linear legume with a recurved apex.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFACFF87FC84F868856FFA79.taxon	discussion	Comments. This is an infrequent species in the study area. It grows in intermediate and full sunlight on slopes and in grasslands in moderately deep, moist soils. This perennial species differs from other Vicia species by the presence of peduncle racemes with flowers smaller than 1.4 cm long, and pubescent leaves with 3 – 5 linearlanceolate to oblong pairs of leaflets.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFADFF87FC84FBF68426F971.taxon	description	Figure 25 Pavonia cymbalaria A. St. - Hil. & Naudin (1842): 42 — Cabrera (1965 a): 176; Flora Argentina (2017); Tropicos (2017). Chamaephytes, native with distribution in the Southern Cone Region of South America. Characteristics. Subshrub with many creeping branches, to 60 cm long, and densely pubescent ascending stems. Leaves with stipulates; ovate to triangular, margins crenate, glaucous, covered with short hairs. Flowers solitary; epicalyx with oval bracts; corolla with pink-lilaceous petals; nerves and basal stained red to violet. Fruit: a schizocarp, with reticulated mericarps.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFADFF87FC84FBF68426F971.taxon	discussion	Comments. This is a frequent species in the study area. It grows in shallow to moderately deep soils on slopes, including grassy slopes, and on summits. In the mountain ranges also grows Pavonia glechomoides A. St. Hil., which differs from P. cymbalaria by the presence of long hair pubescence, suborbiculate leaves, thin epicalyx bracts, and white or pinkish petals with the basal stain purple.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFADFF87FF01F9CA8497FC42.taxon	description	Figure 24 A, B	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFADFF87FF01F9CA8497FC42.taxon	description	Characteristics. Annual or biennial herb, with erect or prostrate leafy stems, 5 – 15 cm tall. Leaves simple, linear in shape, ca 6 – 8 cm long and 1 – 1.7 mm wide. Inflorescence: a spike-like raceme, to 2.5 cm long, with zygomorphic, perfect flowers, ca 2 mm long, with white petals. Fruit: an orbicular capsule that contains seeds with a ring of hairs.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFADFF87FF01F9CA8497FC42.taxon	discussion	Comments. This is a frequent species in the study area. It grows in shallow, damp soils on grassland slopes and on the summits. Polygala australis shares habitat with P. linoides Poir., which, however, is a perennial herb with lilac flowers (Fig. 24 C) and presents seeds without a ring of hairs.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFADFF80FC84F8F28382FB7A.taxon	description	(Cambess.) Landrum Figure 26	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFADFF80FC84F8F28382FB7A.taxon	description	Cryptophytes, native with distribution in the Southern Cone Region of South America. Characteristics. Aromatic, dwarf shrub, to 10 – 50 cm tall, with rhizomes and many creeping branches. Leaves opposite, elliptic, with apex acuminate. Flowers solitary, axillary, with 5 white petals, 5 sepals, numerous stamens; pedicels shorter than leaves. Fruit: a globose, green to red berry with persistent calyx.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFADFF80FC84F8F28382FB7A.taxon	discussion	Comments. This is a frequent species in the study area. It grows in shallow soils and in rock cracks on summits and in bare and grassy slopes. In mountain ranges it grows as a small shrub, to 20 cm tall. It is the only species of Psidium occurring in Buenos Aires province. It is recognized from other species of Mirtaceae by its creeping form and the number of sepals.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFAAFF81FC84FACF85B6FD3D.taxon	description	Figure 27	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFAAFF81FC84FACF85B6FD3D.taxon	description	Characteristics. Perennial herb with pivoting and fleshy roots. Bulb globose, covered with scales from the leaf sheaths. Leaves long, petiolated, trifoliate, pubescent and arranged in a basal rosette. Leaflets semi-fleshy, obovate shape and with subtle emarginated apex. Inflo- rescence: an umbel, with 3 – 5 actinomorphic flowers with five pink to purple petals and five sepals. Fruit: a cylindri- cal capsule.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFAAFF81FC84FACF85B6FD3D.taxon	discussion	Comments. This is a very frequent species in the study area. It grows in grassy slopes, cracks, and rocky outcrops on the slopes and on the summit. It differs from other Oxalis that have also been found in mountain ranges, by its simple bulb, leaflet with subtle emarginated apex and inflorescence with at least 3 pinkish flowers.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFABFF81FF01FC968660F8DC.taxon	description	Figure 28 A – C	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFABFF81FF01FC968660F8DC.taxon	description	Characteristics. Rhizomatous, glaucous shrub, to 3 m tall. Spines triangular, compressed, decussate, without marked leaf nodes. Leaves ovate – lanceolate, to 7 mm long, promptly deciduous. Inflorescence: fascicle with 2 – 9 flowers. Flowers white, ca 1 cm long; sepals oblong-lanceolate, reflexes; corolla absent. Fruit: 3 - locu- lar capsule.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFABFF81FF01FC968660F8DC.taxon	discussion	Comments. This is a very frequent species in the study area. It grows in intermediate and full sunlight conditions on grasslands and on slopes in moderately deep, moist soils. It also grows under the trees and in cracks of the slopes and summit. This species could be confused with other Rhamnaceae that are frequently found in the mountain ranges of Buenos Aires province: Colletia spinosissima J. F. Gmel. and Discaria americana Gillies & Hook. These species differ from C. paradoxa in vegetative morphologic characters. Colletia spinosissima has dark yellowish-green branches and cylindrical spines (Fig. 28 D), while D. americana has leaf nodes with a transversal mark (Tortosa 1995). Superorder Caryophyllanae Order Caryophyllales: Family Cactaceae: Tribe Trichocereeae	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFABFF81FF01F826821BFAFE.taxon	description	Figure 29	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFABFF81FF01F826821BFAFE.taxon	description	Chamaephytes; native with wide distribution in the Southern Cone Region of South America. Vulnerable, reasons unknown (Delucchi 2006). Characteristics. Perennial, glaucous to green herb with greatly enlarged, globose stem, to 20 cm long, 10 cm wide, and 12 – 16 lobed ribs. Areoles with 7 – 15 rigid spines. Flowers located in the superior areoles, 6 cm wide. Perianth white; external scales green, with ovate shape and acute apex. Fruit: fusiform or piriform shape.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFABFF81FF01F826821BFAFE.taxon	discussion	Comments. This is a frequent species in the study area. It grows in full sunlight conditions in cracks on the slopes. It differs from other Cactaceae from the study area by the color of the flowers; Wigginsia and Parodia species have yellow flowers, while G. gibbosum has white flowers. Superorder Asteranae Order Apiales: Family Apiaceae: Tribe Saniculeae	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFABFF82FC84FA058552FC44.taxon	description	Figure 30	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFABFF82FC84FA058552FC44.taxon	description	Hemicryptophytes, native with wide distribution in the Southern Cone Region of South America. Characteristics. Perennial herbs with rhizomes and erect branches, to 2 m tall. Leaves glabrous, membranous; basal leaves flaccid, linear, with parallel veins and ap- pressed, solitary bristles in the margin (frequently 2 at the base), to 1 m long and 15 mm wide, larger than the caulinar leaves. Inflorescence: a dichotomous cyme, with ovoid, greenish-white capitulums (1.2 × 1 cm). Fruit: a schizocarp composed of 2 mericarps with lateral scales and vesicles on the upper lower surface, rare or absent in the base.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFABFF82FC84FA058552FC44.taxon	discussion	Comments. This is a frequent species in the study area. It grows in full sunlight conditions, in moderately deep, damp soils and in cracks on the slopes. Up to 2007, E. regnellii was confused with E. stenophyllum Urb. (Calviño and Martínez 2007), a species reported from Buenos Aires province. Eryngium stenophyllum differs from E. regnellii in leaf and mericarp characteristics. It presents coriaceous leaves with 1 – 3 bristles that are up to 15 mm long at the margin, and mericarps with lateral free scales and a naked lower surface.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA8FF82FF01FBFC86FCF8DD.taxon	description	Figure 31 Baccharis dracunculifolia DC ssp. tandilensis (Speg.) Giuliano ex Zuloaga et al. (2014 a): 71 — Flora Argentina (2017).	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA8FF82FF01FBFC86FCF8DD.taxon	description	Characteristics. Dioecious species. Globose shrub, 1 – 5 m tall. Young branches pubescent with alternated leaves. Leaves: obovate shape, length – width ratio between 1.8: 1 and 3.6: 1. Capitulum: sessile or subsessile, with yellow florets and white pappus. Male capitulum with tubular disc florets, up 3 mm long; female capitulum with filiform florets, 4 – 5 mm long.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA8FF82FF01FBFC86FCF8DD.taxon	discussion	Comments. This is a very frequent species in the study area. It grows in various habitats, from deep soils of grasslands, to shallow soils and cracks of the slopes and summit. It is similar to Baccharis draunculifolia ssp. dracunculifolia, but it has linear leaves (length-width ratio 6: 3: 1 – 11: 6: 1), and it does not occur in south-eastern Buenos Aires province.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA8FF83FF01F8218554FF57.taxon	description	Figure 32	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA8FF83FF01F8218554FF57.taxon	description	Characteristics. Shrub with many branches, to 40 cm tall, with pinnatisect, spiniform and rigid leaves, 1 – 2.5 cm long. Capitulum radiate, bell-shaped, 7 mm long, with white ray outer florets and yellow tubular disc florets. Achenes with glandular and pubescent surface, 3.5 – 4 mm long, crowned by a white pappus.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA8FF83FF01F8218554FF57.taxon	discussion	Comments. This is an infrequent species in the study area, but it is a common species in other mountain ranges of the Tandilia system. It grows in full sunlight conditions, in the shallow soils and cracks at the summit. Sommerfeltia spinulosa is the only species of its genus that has been found in Argentina.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA9FF83FF01FB77849EF845.taxon	description	Flora Argentina (2017); Tropicos (2017).	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA9FF83FF01FB77849EF845.taxon	description	Characteristics. Perennial herb, to 60 cm tall, with simple ascending branches, densely covered with leaves and lanate and glandular hairs. Leaves with spatulate shape, mucronate or obtuse apex, entire margin and attenuate to decurrent base. Leaf surface concolor or weakly bicolor with lanate and glandular hairs, denser on the abaxial surface. Inflorescences: capitulums with numerous filiform outer florets and only 3 or 4 tubular disc florets, arrange in glomerules, placed over pseudospiciform arrays interrupted by leaves. Phyllaries with lanate hairs.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA9FF83FF01FB77849EF845.taxon	discussion	Comments. This is a frequent species in the study area. It grows in intermediate and full sunlight conditions and on shallow soils and cracks on the slopes and summit. It differs from other Gamochaeta species that grow in Buenos Aires province by the leaf hair type: G. pensylvanica has lanate and glandular hairs. Cabrera (1963) and Hurrell (2013), who only noted the presence of glandular hairs in G. platensis, considered G. pensylvanica and G. platensis to be different species .. However, Freire and Iharlegui (2014) considered that these taxa to be synonyms.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA9FF83FF01FEE3859BFB0D.taxon	description	Figure 33 Stevia satureiifolia (Lam.) Sch. Bip. var. patagonica (Hieron.) Hierony- mus (1897): 737 — Cabrera (1963): 37; Cabrera and Freire (1997): 94; Zuloaga et al. (2014 a): 428; Tropicos (2017).	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA9FF83FF01FEE3859BFB0D.taxon	description	Chamaephytes, native with distribution in the Southern Cone Region of South America. Least Concern (Delucchi 2006). Characteristics. Suffrutescent with many branches and leaves, 20 – 60 cm tall. Leaves pubescent, linear, to 2.5 cm long and 2 mm in diameter and with obtuse apex. Capitulums: isomorph, with a brief peduncle and pinkish tubular florets, disposed in dense corymbs. Achenes: cylindrical, with glabrous surface and reddish pappus.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA9FF83FF01FEE3859BFB0D.taxon	discussion	Comments. This is an infrequent species in the study area. It grows in full sunlight conditions, in shallow soils and deep cracks of rocks on the grassland slopes and on the summit. This species is similar to S. multiaristata Spreng and S. aristata Don but S. multiaristata presents long peduncles and S. aristata has rhombic leaves.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA6FF8CFF01F94E83F1FA57.taxon	description	& Matzenbacher Figure 36	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA6FF8CFF01F94E83F1FA57.taxon	description	Cryptophytes; native with wide distribution in the Southern Cone Region of South America. Vulnerable, reasons unknown (Delucchi 2006). Characteristics. Perennial herb, with latex, rhizomes and simple or bifurcated erect stems, 10 – 40 cm tall. Leaves arrange in a basal rosette, with oblanceolate shape, lobate to pinnatisect margin, attenuate base and acute apex. Inflorescence: solitary discoid capitulums with yellow florets. Achenes with a short thick beak, ca 0.5 mm in diameter, crowned by a pappus with 1 - series plumose hairs.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA6FF8CFF01F94E83F1FA57.taxon	discussion	Comments. This is an infrequent species in the study area. It grows in full sunlight conditions in shallow soils at the summit. Hypochaeris neopinnatifida and H. pampasica Cabrera differ from the other Hypochaeris species in Buenos Aires province by having achenes with beaks that are shorter than the seminiferous portion, and a 1 - series pappus hair disposition. Particularly, H. pampasica has a thinner beak than H. neopinnatifida.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA6FF8CFF01FC618582F924.taxon	description	Figure 35	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA6FF8CFF01FC618582F924.taxon	description	Hemicryptophytes, native with wide distribution in the Southern Cone Region of South America, previously recorded in Buenos Aires province but not in mountainous areas. Characteristics. Perennial herb with brief xylopodium, to 80 cm tall, branches tomentouse to glabrous. Leaves with ovate to lanceolate shape, acute apex, dentate edge and decurrent base, giving the appearance of having winged stems. Abaxial surface of the leaves tomentouse; adaxial surface glabrous. Inflorescence: capitulums with numerous filiform outer florets and only 2 or 3 white tubu- lar disc florets. Achenes with glandular-pubescent surface.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA6FF8CFF01FC618582F924.taxon	discussion	Comments. This is a rare species in the study area. It grows in full sunlight conditions, on deep soils and in cracks of the slopes. It differs from other Pterocaulon species that grow in Buenos Aires province by being less than 100 cm tall, and by having dentage, oblanceolate leaves as well as inflorescence with branched spikes.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA6FF8DFC84F99C8520FC6E.taxon	description	Figure 37	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA6FF8DFC84F99C8520FC6E.taxon	description	Cryptophytes; endemic to mountain ranges of Buenos Aires province. Critically Endangered, reasons unknown (Delucchi 2006). Characteristics. Perennial herb with latex; rhizomes erect; stems ramified and lanose, to 60 cm tall. Leaves in a basal rosette, with lanceolate shape, ca 12 cm long, 3 cm in diameter, caulinar leaves smaller and without rigid or stiff bristles. Inflorescence: discoid capitulums with yellow florets in a cymose-corymb inflorescence. The phyllaries have lanuginose hairs mixed with black, short, soft, glandular hairs. Black-red achenes crowned by a light brown pappus.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA6FF8DFC84F99C8520FC6E.taxon	discussion	Comments. This is a rare species in the study area. It grows in full sunlight conditions in cracks at the summit. Hieracium palezieuxii Zahn and H. burkartii Sleumer also occur in the region but H. palezieuxii presents rigid and stiff bristles on the stems and leaves, while H. burkartii has rigid bristles on the phyllaries.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA7FF8DFF01FBE58343FBCA.taxon	description	Figure 38	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA7FF8DFF01FBE58343FBCA.taxon	description	Characteristics. Perennial herb with fascicled thick roots. Leaves in a basal rosette, green in the adaxial surface and white in the abaxial one, 0.7 – 1.5 cm wide, with oblanceolate shape, retrorsely-dentate margin, acute apex and long attenuate base ending in a sheathed petiole. Inflorescence: solitary discoid capitulums at the end of a lanate peduncle, with glabrous phyllaries and three kinds of white florets; ray outer florets (female flowers), filiform intermediate florets (female flowers) and bilabiate disc florets in the center of the head (hermaphrodite flowers). Achenes with a beak and crowned by a reddish pappus.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA7FF8DFF01FBE58343FBCA.taxon	discussion	Comments. This is an infrequent species in the study area. It grows in shallow to moderately deep, damp soils of the summit and grassland slopes. Chaptalia exscapa (Pers.) Baker is a species frequently found in the Tandilia mountain range, but it differs from C. piloselloides by the 2 to 4 cm wide leaves, achenes without beak, and lack of scape when flowering.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA7FF8EFC84FB72857EFA18.taxon	description	123; Tropicos (2017).	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA7FF8EFC84FB72857EFA18.taxon	description	Characteristics. Perennial herb with erect stems, to 1 m tall. Leaves with lanceolate shape, acute apex, attenuate base and serrate margin. Adaxial leaf surface lanose to glabrous; abaxial leaf surface tomentose, white. Inflo- rescence: radiate capitulums with ray yellow outer florets,	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA7FF8EFC84FB72857EFA18.taxon	discussion	Comments. This is a frequent species in the study area. It grows in full sunlight conditions in deep to moderately deep soils or in deep cracks on grassland slopes. It can be recognized by its densely glandular hairs, entire or dentate leaf margin and 14 – 15 mm tall involucre. and yellow tubular disc florets disposed in cymose-cor- ymb inflorescences at the end of the branches; phylla- ries densely covered with white tomentose hairs. Fruits: achenes with sericeous pubescent surface and white pappus. Comments. This is an infrequent species in the study area. It grows in full sunlight conditions in cracks on the summit. Senecio grisebachii var. subincanus is the only variety of S. grisebachii that has been recorded in the region. It can be recognized by its tomentose, not glandular hairs and its pubescent achenes.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA4FF8EFC84FC4B84A5F84A.taxon	description	Figure 41	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA4FF8EFC84FC4B84A5F84A.taxon	description	Glandularia pulchella (Sweet) Tronc. var. gracilior Tronc. (1964): 470 — Cabrera (1965 b): 139. Verbena tenera Spreng. (1825 a): 750 — Tropicos (2017). Hemicryptophytes; native with wide distribution in the Southern Cone Region of South America. Critically Endangered, reasons unknown (Delucchi 2006). Characteristics. Prostrate herb with strigose pubescence in stems and floral branches. Leaves briefly petiolate with petiole less than 10 mm. Leaf blade of 15 – 20 mm long and 15 mm wide, 3 - to 5 - dissected to bipinnatisect, segments linear to narrowly ovate and both surfaces strigose; the abaxial surface presents glands. Inflorescences: dense multifloral spikes arranged in monobotrya or pleiobotrya with frondose paracladia; peduncles 15 – 20 mm long. Floral bracts 3.5 – 4.5 mm long, ovate, with acute apex and strigose pubescence with patelliform glands; calyx 8 – 9 mm long, strigose with some patelliform glands; corolla 12 – 13 mm long, externally glabrous, lilac to violet. Fruit: cluses of 4 – 6 mm long, 1.5 – 2 mm wide, with rostrate apex.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA4FF8EFC84FC4B84A5F84A.taxon	discussion	Comments. This is a frequent species in the study area. It grows in full sunlight conditions in shallow soils on grassland slopes and at the summit. Glandularia tenera and G. peruviana (L.) Small, both commonly in southern Buenos Aires province. G. peruviana has leaves entire and the corolla red.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA4FF8EFF01FA14855EF7A7.taxon	description	Figure 40	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA4FF8EFF01FA14855EF7A7.taxon	description	(2017).	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA4FF8EFF01FA14855EF7A7.taxon	description	Characteristics. Suffrutescent, to 1 m tall, with nu- merous leaves in the base of the plant. Leaves oblanceolate-spatulate, with obtuse apex and serrated margins, densely covered with white glandular hairs. Superior plant leaves sessile, with auriculate base. Inferior leaves with an auriculated pseudo-stalk and attenuate base. Inflorescence: bell-shaped radiate capitulums with yellow ray outer florets and yellow tubular disc florets disposed in loose corymbs. Fruits: cylindrical achenes with glabrous surface and white pappus.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA5FF8FFF01F9A88243FCB8.taxon	description	Figure 43 Borreria dasycephala (Cham. & Schltdl.) Bacigalupo & E. L. Cabral (1996): 306 — Flora Argentina (2017); Tropicos (2017). Diodia dasycephala Cham. & Schltdl. (1828): 348 — Cabrera (1965 b): 351. Hemicryptophytes, native with wide distribution in the Southern Cone Region of South America; previously recorded in Buenos Aires province but not in mountain range areas. Characteristics. Perennial, rhizomatous herb with tetragonal stems. Leaves glabrous, with ovate-oblong shape, acute apex and attenuate base. Flowers: terminal or subtermianl, in groups of 1 – 3 flowers per peduncle; corolla and anthers white. Fruit: 2 mericarps with pubescence at the top.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA5FF8FFF01F9A88243FCB8.taxon	discussion	Comments. This is a very frequent species in the study area. It grows in full sunlight conditions with other short species in deep and moderately deep soils on grassland slopes and at the summit. This species has been described as an annual species (Flora Argentina 2017) contrary to the specimens seen in the Paititi Reserve, which are hemicryptophyte herbs as previously described by Cabrera (1965 b) and Delprete et al. (2005).	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA5FF8FFF01FD618789FA4A.taxon	description	Figure 42 Pelletiera verna A. St. Hil. (1822): 365 — Flora Argentina (2017); Tropicos (2017).	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA5FF8FFF01FD618789FA4A.taxon	description	Characteristics. Annual, dwarf herb, to 10 cm tall, with angular stems. Leaves 4 – 6 mm long, opposite, sessile, with eliptic shape, acute apex and denticulate margin. Flowers: subsessil, 2 – 3 mm long; sepals linearlanceolate with apex acute; corolla white, smaller than the calyx. Fruit: globose capsule, 2 mm long, longitudinal dehiscent.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA5FF8FFF01FD618789FA4A.taxon	discussion	Comments. This is an infrequent species in the study area. It grows in full sunlight conditions in shallow soils on grassland slopes and at the summit. Pelletiera verna is the only species of its genus in Argentina. Order Gentianales: Family Rubiaceae: Tribe Spermacoceae	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA5FF88FC84FC0B862AFC8E.taxon	description	Figure 44 Galium hirtum Lamark (1786): 583 ― Cabrera (1965 b): 367; Flora Argentina (2017); Tropicos (2017). Relbunium hirtum (Lam.) K. Schumann, ex Martius C. F. P. (1888): 107 — Cabrera (1965 b): 367. Therophytes, native with distribution in the Southern Cone Region of South America. Characteristics. Annual herb with tetragonal, pubescent stems. Leaves pubescent, ovate, with apex acute. Pseudoverticils formed by 2 leaves and 2 foliar stipules. Flowers: solitarly upon peduncles that are smaller than the involucral bracts; 4 yellow, small petals. Fruit: a white berry.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA5FF88FC84FC0B862AFC8E.taxon	discussion	Comments. This is a frequent species in the study area. It grows in shaded, moist soils and under the trees. It grows with other Galium species such as G. aparine, an annual herb with sticky hairs on leaves and fruits, and G. hipocarpium, a perennial herb with long peduncle flow- ers and red berries.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA2FF88FF01FCA687BEF9FC.taxon	description	Fig. 45	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA2FF88FF01FCA687BEF9FC.taxon	description	Valantia hypocarpia L. (1759): 1307 Hemicryptophytes, native with wide distribution in the Southern Cone Region of South Americ; previously recorded in Buenos Aires province but not from mountain range areas. Vulnerable (Delucchi 2006). Characteristics. Perennial herb with tetragonal stems and thin, reflexed pubescence. Roots: fibrous, arising from inferior stem nodes. Leaves: oblong, ovateobovate, with apex acute, obtuse, or cuspidate, margin revolute, and pubescence fine. Pseudoverticils formed by 2 leaves and 2 foliar stipules. Flowers: solitarly, placed upon peduncles that are larger than the involucral bracts. Fruit: a red berry.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA2FF88FF01FCA687BEF9FC.taxon	discussion	Comments. This is an infrequent species in the study area. It grows in damp soils, under trees and in grasslands near the summit. It is similar to G. noxium (A. St. Hil.) Dempster ssp. valantioides (Cham. & Schltdl.) Demp- ster, which, however, has white berries. Order Lamiales: Family Plantaginaceae: Tribe Plantagineae	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA2FF88FF01F9018394FC16.taxon	description	Figure 46	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA2FF88FF01F9018394FC16.taxon	description	Characteristics. Shrub with numerous ascendant branches, 20 – 50 cm tall. Leaves: glabrous or slightly pubescent, with linear shape, 3 – 5 veins and sheathed base; 8 – 20 cm long and 1 – 3 mm wide. Inflorescences: cylindrical dense spikes, 1 – 5 cm long; peduncles longer than the leaves; flowers with free sepals. Fruit: a capsule with 2 seeds.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
03AA7235FFA2FF88FF01F9018394FC16.taxon	discussion	Comments: This is a rare species in the study area. It grows in full sunlight conditions in cracks on the summit. Plantago bismarckii Nederlein, a species endemic to the Ventania mountain range, has sericeous-tomentose leaves and a smaller spike than P. tandilensis.	en	Echeverría, María L., Alonso, Sara I., Comparatore, Viviana M. (2017): Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina). Check List 13 (6): 1003-1036, DOI: 10.15560/13.6.1003, URL: http://dx.doi.org/10.15560/13.6.1003
