Guatteria beckii Maas & Westra, 2015

Maas, P. J. M., Westra, L. Y. T., Guerrero, S. Arias, Lobão, A. Q., Scharf, U., Zamora, N. A. & Erkens, R. H. J., 2015, Confronting a morphological nightmare: revision of the Neotropical genus Guatteria (Annonaceae), Blumea 60 (1), pp. 1-219 : 43

20. Guatteria beckii Maas & Westra , sp. nov. — Fig. 13e, f , 18 ; Plate 2c ; Map 6

Guatteriae maypurensis affinis sed differt monocarpiis ellipsoideis nec anguste oblongo-ellipsoideis, praeterea pedicellis brevioribus et sepalis longioribus distincta. — Typus: Beck & Haase 9895 (holo U 2 sheets; iso G, LPB, M, MO, NY), Bolivia, La Paz, Prov. Iturralde, Luisita, wet savanna W of Río Beni, 180 m, 22 Feb. 1984 .

Shrub, small tree, or liana 3–7 m tall, diam not recorded; young twigs sparsely to rather densely covered with erect and some appressed hairs, soon glabrous. Leaves: petiole 3–10 mm long, 1–3 mm diam; lamina narrowly elliptic, 10–17 by 4–6 cm (leaf index 2.5–3.7), chartaceous, not verruculose, shiny, grey to greyish brown above, brown below, glabrous above, sparsely covered with appressed hairs to glabrous below, base acute, sometimes obtuse, apex acuminate (acumen 5–10 mm long), primary vein impressed above, secondary veins distinct, 10–15 on either side of primary vein, raised above, indistinctly loop-forming, smallest distance between loops and margin 3–4 mm, tertiary veins raised above, often distinctly reticulate. Flowers in 1(–2)-flowered inflorescences in axils of leaves; pedicels 15–20 mm long, c. 1 mm diam, fruiting pedicels to c. 2 mm diam, sparsely to densely covered with erect hairs, articulated at 0.2–0.3 from the base, bracts 5–6, soon falling, only most basal bract seen, broadly triangular-ovate, 1–1.5 mm long; flower buds depressed ovoid; sepals free, broadly ovate-triangular, 5–8 by 5–6 mm, reflexed, outer densely covered with appressed hairs; petals yellow to greenish brown in vivo, obovate, 15–25 by 7–15 mm, outer side densely covered with appressed, greyish hairs; stamens c. 1.5 mm long, connective shield papillate. Monocarps 25–75, green, maturing black in vivo, black in sicco, ellipsoid, 7–11 by 4–6 mm, sparsely covered with appressed hairs, apex apiculate (apiculum c. 0.5 mm long), wall c. 0.2 mm thick, stipes 6–15 by c. 1 mm. Seed ellipsoid, 6–10 by 4–5 mm, pale to dark shiny brown, pitted, raphe raised.

Distribution — Bolivia (Beni, Santa Cruz), Peru (Junín), Brazil (Acre, Amazonas).

Habitat & Ecology — In floodplain forest, terra firme forest, wet savannas, or secondary roadside vegetation, on clayey soils (the collections from Brazil). At elevations of 150–250 (–1100) m. Flowering: January, February, May, July; fruiting: February, May, July, September.

Vernacular names — Not recorded.

Other specimens examined. BOLIVIA, Beni, Río Yata, c. 40 km SW of Guayaramirim, Anderson & McPherson 11916 ( U) ; Prov. Moxos, 3 km S of Puerto Palomo , 255 m, Meneces & Terceros 335 ( U) ; Prov. Vaca Diez, 1 & 2 km at SW edge of Riberalta , 230 m, Solomon 7652 ( MO, U) ; Prov. Vaca Diez, Riberalta , 170 m, Solomon 16789 ( G, LPB, MO, OWU, U, WU) . Santa Cruz, Parque Nacional Noel Kempff, Praina Boliviana , near artificial beach of Pimenteira, 150 m, Arroyo et al. 2638 ( U) ; Parque Nacional Noel Kempff, Lago Caiman , 220 m, Garvizu & Fuentes 370 ( U) . – BRAZIL, Acre, Mun. Rio Branco, between km 22 and 37of the Rio Branco-Porto Velho Highway, near Iquiri igarapé, 8 Feb. 1979, Albuquerque et al. 1341 ( U) . Rondônia, Porto Velho, km 60–64 of road Guajará-Mirim to Abunã , Carreira et al. 497 ( NY, U) . – PERU, Junín, Manto, km 20 W of Yaupi , 1100 m, 11 July 1961, Woytkowski 6530 ( MO, U) .

Notes — Guatteria beckii is named after our friend and collegue Dr. Stephan Beck who has been and still is a very active collector and stimulator of botanic research in Bolivia.

Guatteria beckii , a small shrub, tree, or even liana (‘vine’), oc- curs in the Bolivian states of Beni and Santa Cruz, the Peruvian state of Junín, and the adjacent Brazilian states of Acre and Amazonas where it mostly inhabits wet savannas or floodplain forests. It is recognizable by a distinct reticulate tertiary vena- tion on the upper side of the leaves and by seeds with a very distinct raphe, a feature rarely seen in Guatteria .

It might be confused with G. maypurensis , another savanna inhabiting species occurring in Bolivia, but in the latter the leaves are often folded lengthwise in dry condition, and the pedicels are shorter while the sepals are longer (pedicels 15–20 mm vs 15– 50 mm in G. maypurensis and sepals 5–8 vs 3–4 mm).

Figures

Plate 2 a, b. Guatteria arenicola Maas & Erkens. a. Fruiting branches; b. fruits. – c. Guatteria beckii Maas & Westra. Fruiting branch. – d. Guatteria argentea Erkens & Maas. Top of branchlet showing silvery indument; e. fruits. – f, g. Guatteria blainii (Griseb.) Urb. f. Flower; g. fruit (a, b: Rodriguez R.3095; c: Solomon 16789; d, e: Maas et al. 10525; f, g: Maas & Mejia 6443). — Photos: a, b: E. Rodriguez R.; c: J. Solomon; d–g: P.J.M. Maas.

Fig. 13 a. Guatteria amapaensis Maas & Westra. Fruit. – b. Guatteria antioquensis Maas & Westra.Fruit. – c. Guatteria atabapensis Aristeg. ex D.M.Johnson & N.A.Murray. Fruiting branch, detail. – d. Guatteria auyantepuiensis Maas & Westra. Detail of flower. – e, f. Guatteria beckii Maas & Westra. e. Flower; f. fruit. – g. Guatteria beniensis Maas & Westra. Young fruit, also note densely erect hairy juvenile parts in upper left. – h. Guatteria blainii (Griseb.) Urb. Detail of flower (a: Daly et al. 4028, U; b: E. Correa et al. 93, U; c: Wurdack & Adderley 42759, isotype US; d: F. Cardona 2619, holotype US; e, f: Beck & Haase 9895, holotype U; g: Nee 34593, holotype NY; h: Ekman 5920, S).

Fig. 18 Guatteria beckii Maas & Westra. Flowering branch (Beck & Haase 9895; holotype U).