Myrcia hatschbachii D. Legrand (1961: 293)

Santos, Matheus F., 2025, Taxonomic monograph of Myrcia sect. Eugeniopsis (Myrciinae, Myrteae, Myrtaceae), an endemic clade of Eastern South America, Phytotaxa 703 (1), pp. 1-100 : 40-43

7. Myrcia hatschbachii D. Legrand (1961: 293) . Type:— BRAZIL. Paraná: Curitiba, Caixa de Água Nova , 21 December 1943 (fl.), Hatschbach 79 (holotype MVM! [image], isotypes MBM!, RB!) ( Figures 21A–E , 22 , 23 ) .

Description:— Shrub to tree, 2.5 to 25 m high. Trichome reddish, simple or dibrachiate, 0.1–0.4 mm. Twig when young flattened, tomentose, pubescent to puberulent, when mature greyish (when dry), cylindrical, cortex slightly cracked; branching monopodial or sympodial, internode 2.0– 5.2 cm, node slender; cataphylls present (usually in sympodial branching), early deciduous; buds tomentose or pubescent. Leaf concolorous, chartaceous, blade 3.8–13.1 × 1.8–5.3 cm, narrowly elliptic to elliptic or obovate, apex acuminate to acute or caudate, base cuneate to obtuse, margin plane, secondary veins 3–8 mm apart, held at an angle of 60–85° relative to the midvein, marginal vein 1 mm from the margin, tertiary veins conspicuous in both surfaces, areoles 0.5–1.0 mm, pellucid dots inconspicuous in the abaxial surface, 2–7 per mm 2; adaxial surface subglabrate to glabrous (except midvein), secondary veins raised; abaxial surface puberulent, secondary veins raised; petiole 3–8 × 1–2 mm, canaliculate, tomentose or puberulent. Inflorescence ferrugineous in the rachis (due to trichomes), 5.0–11.5 × 3.0–8.0 cm, 23–+100 flowers, axillar at the terminal or subterminal nodes of the SGU (central bud developing a vegetative branch), usually only one pair per SGU, one inflorescence per axillary bud, inflorescence pherophyll usually deciduous, opposite branching, three to five branching per node, rachis tomentose or pubescent to puberulent, first internode of central rachis 1 mm wide; bracts not seen, probably deciduous; bracteoles 0.4–0.6 × 0.2–0.4 mm, deciduous, lanceolate or ovate, plane, apex acuminate, base truncate, both surfaces puberulent. Flower bud 2–3 × 1–2 mm, turbinate, corolla apparent before anthesis; hypanthium 0.8–1.6 mm extending above the summit of the ovary, not tearing at anthesis, externally pubescent to puberulent, pellucid dots covering the whole surface or inconspicuous; calyx 4–5–merous, lobes 0.4–1.4 × 0.6–1.4 mm, not fused, deciduous parallel to the hypanthium ring, depressed ovate to widely depressed ovate, concave, apex rounded, both surfaces puberulent; corolla 4–5–merous, petals cream to white, 0.8–1.6 × 0.8–1.6 mm, very widely ovate, plane, apex rounded, externally puberulent to glabrous, internally subglabrate to glabrous; staminal ring 0.2–0.4 mm wide, glabrous, stamens 50–80, filament 0.8–4.0 mm long, anther 0.24–0.32 × 0.24–0.40 mm, gland at the apex; ovary 0.6–0.8 × 0.8–1.0 mm, obconic, style 4.0– 4.8 mm long, glabrous, stigma capitate. Fruit mature purple, ca. 0.5 × 0.5 cm, globose, base rounded, subglabrate, totally covered by pellucid dots, remnants of hypanthium and calyx present; seeds 1–3 per fruit.

Distribution and Habitat: — Myrcia hatschbachii is found in the subtropical regions of the Atlantic Forest domain, specifically in Paraná, Santa Catarina and Rio Grande do Sul states ( Figure 23 ). The species inhabits various vegetation types, including subtropical (Araucaria) forests, riparian forests, and forest patches within montane grasslands (locally known as “faxinal”); it can even be found in areas of human disturbed vegetation. It occurs at elevations ranging from 112 to 1,160 meters, though it is typically found above 500 meters. The species occasionally forms dense population.

Phenology: —Flowering has been recorded from September to March, peaking between November and January. Fruits are present from November to April, with mature fruits observed in December and January.

Conservation Status: — Myrcia hatschbachii has a wide distribution area (Extent of Occurrence is 123,005 km 2, threshold of Least Concern; sensu IUCN 2022), is recorded in protected areas and is generally common across its range. The small Area of Occupancy (232 km 2, threshold of Endangered) may reflect limited collection effort rather than an actual restricted distribution. Based on these factors, the species is preliminarily classified as Least Concern (LC; IUCN 2022).

Taxonomy: — Myrcia hatschbachii is one of the four species of Myrcia sect. Eugeniopsis with a distinctive open flower bud, revealing the corolla prior to anthesis (the other being Myrcia advena , Myrcia oblongata and Myrcia tenuivenosa ). This feature has historically kept these species within Myrcia rather than Eugeniopsis of Marlierea . Beyond flower bud morphology, the species is characterized by either monopodial or sympodial branching, elliptic or obovate leaf blades with raised secondary and tertiary veins on both surfaces, inflorescence that emerge from the axils of terminal or subterminal nodes of the SGU, turbinate flower bud, and flower 4–5–merous with a capitate stigma ( Figure 21A–E ). Local names in Paraná state include “caingá”, “caingá-vermelha”.

Illustrations and images in previous works: — Legrand (1961), Bizarro et al. (2021), Lannoy et al. (2021).

Additional specimens examined: — BRAZIL. Paraná: unknown municipality, 18 March 1909 (fr.), P . Dusén 8251 ( S); 8 December 1910 (fl.), P . Dusén 11320 B ( S). Mun. Bocaiúva do Sul, 21 December 1960 (fl.), G . Hatschbach 7611 ( MBM); ibidem, 26 January 2005 (fr.), R . Mello-Silva 3738 ( SPF). Mun. Campina Grande do Sul, 24 September 1958 (fl.), G . Hatschbach 5219 ( MBM, PEUFR). Mun. Colombo , 10 January 1963 (fl.), G . Hatschbach 9694 ( MBM); ibidem, 11 November 2005 (fl.), R. F. S . Possette 599 ( RB); ibidem, 17 November 1986 (fl.), F. C . Silva s.n. ( RB255018 ). Mun. Contenda, 4 February 1959 (fr.), G . Hatschbach 5517 ( MBM). Mun. Curitiba , 4 April 1914 (fr.), G . Jönsson 133 ( RB); ibidem, 1 January 1968 (fl.), C . Stellfeld 1706 ( UFP); ibidem, 13 January 1965 (fl.), L. B . Smith 14407 ( HBR, NY, P, US); ibidem, 14 December 1978 (fl.), G . Hatschbach 41995 ( MBM, NY, RB, SPF, UB); ibidem, 14 February 1986 (fr.), J. M . Silva 98 ( MBM, NY, PACA, US); ibidem, 14 January 1995 (fr.), G. F . Arbocz 1118 ( SP); ibidem, 15 December 1989 (fl.), A . Dunaiski-Junior s.n. ( MBM191802 ); ibidem, 15 January 2001 (fr.), V. C . Fabri 31 ( BHCB, CESJ, MBM); ibidem, 18 December 1996 (fl.), V. A. O . Dittrich 308 ( MBM); ibidem, 2 January 1982 (fl.), L. R . Landrum 4043 ( MBM, NY); ibidem, 23 March 2004 (fr.), J. M . Silva 4004 ( ALCB, HRCB, HUEFS, MBM, SPF, UB); ibidem, 25 January 1996 (fl.), C . Kozera 85 ( MBM, NY); ibidem, 26 December 1980 (fl.), G . Hatschbach 43871 ( ICN, MBM); ibidem, 26 November 2001 (fl.), A . Lima 94 ( MBM); ibidem, 27 December 1879 (fl.), R . Kummrow 1292 ( ESA, HUEFS, ICN, MBM, NY, SP); ibidem, 29 November 1996 (fl.), C . Kozera 403 ( MBM); ibidem, 4 April 1914 (st.), G . Jönsson 133a ( K, P); ibidem, 4 January 1951 (fl.), G . Tessmann s.n. ( MBM004118 ); ibidem, 4 January 1951 (fl.), G . Tessmann s.n. ( MBM283697 ); ibidem, 7 January 1977 (fl.), L. T . Dombrowski 6696 ( C); ibidem, 27 February 1996 (fr.), J . Cordeiro 1300 ( MBM); ibidem, 13 January 1993 (fl.), J. M . Silva 1202 ( ESA, ICN, IPA, K, MBM, RB, SP); ibidem, 11 November 1997 (fl.), J. M . Silva 2247 ( ALCB, CESJ, G, MBM, SP, UB); ibidem, 23 March 2011 (st.), M. F . Santos 661 ( K, SPF). Mun. Guaratuba , 30 December 1981 (fl.), R . Kummrow 1648 ( MBM, PACA, US). Mun. Imbituva , 14 December 1965 (fl.), R . Reitz 17577 ( HBR, NY, P, US); ibidem, 5 December 1968 (fl.), G . Hatschbach 20465 ( MBM); ibidem, 5 December 1968 (fl.), G . Hatschbach 20475 ( K, RB). Mun. Ipiranga , 14 December 1990 (fl.), S. M . Silva s.n. ( MBM, SP338856 ). Mun. Irati , 13 March 1990 (st.), I . Rauscher s.n. ( W11356 ). Mun. Lapa, 12 December 1972 (fl.), G . Hatschbach 39963 ( MBM); ibidem, 12 November 1972 (fl.), G . Hatschbach 30964 ( K, NY, RB, US). Mun. Mandirituba , 1 February 1983 (fr.), Y. S . Kuniyoshi 4611 ( CESJ, G, HRCB, MBM). Mun. Mateus do Sul, 8 March 1990 (fr.), J. M . Silva 820 ( MBM, US). Mun. Palmeira , 12 January 1966 (fl.), G . Hatschbach 13490 ( MBM, UEC, US). Mun. Paula Frontin , 25 December 1967 (fl.), C . Koczicki 12 ( MBM, NY, S). Mun. Piraquara , 1908-1912 (st.), P . Dusén 5442a ( S); ibidem, 1908-1912 (st.), P . Dusén s.n. ( S13-19148 ); ibidem, no date (fr.), N . Imaguire 2312 ( MBM); ibidem, 10 March 1993 (fr.), A . Vicentini 169 ( MBM); ibidem, 15 March 1972 (fl.), N . Imaguire 2963 ( MBM); ibidem, 2 December 1995 (fl.), G . Hatschbach 64001 ( ALCB, BHCB, G, MBM, SPF, UB); ibidem, 2 December 1995 (fl.), M. L . Kawasaki 906 ( NY, SP); ibidem, 26 December 1977 (fl.), G . Hatschbach 41097 ( MBM, NY); ibidem, 6 January 1993 (fl.), S. R . Ziller 407 ( MBM). Mun. Ponta Grossa , 1904 (st.), P . Dusén s.n. ( S13-19152 ); ibidem, 21 December 1962 (fl.), G . Hatschbach 9602 ( MBM). Mun. Prudentópolis , 9 November 2012 (fl.), M. G . Caxambu 4447 ( MBM). Mun. São José dos Pinhais , 3 January 1962 (fl.), G . Hatschbach 9007 ( HBR); ibidem, 23 January 1986 (fl.), J. M . Silva 82 ( BR, MBM, US); ibidem, January 1982 (fl.), L. T . Dombrowski 12662 ( MBM). Mun. São Mateus do Sul, 1929 (fr.), Gurgel 14709 ( RB); ibidem, no date (fr.), Gurgel s.n. ( RB59415 ). Mun. Tijucas do Sul, 16 December 1981 (fl.), R . Kummrow 1602 ( INPA, MBM, RB, SPF, UB, US). Mun. Turvo , 1 December 1994 (fl.), G. F . Arbocz 1043 ( SP). Rio Grande do Sul: Mun. Antônio Prado, June 2006 (st.), M . Grings 303 ( ICN). Mun. Caxias do Sul, 20 March 2000 (fr.), A . Kegler 903 ( US); ibidem, 6 March 2004 (fr.), A . Kegler 1631 ( BHCB). Mun. Dois Irmãos , November 1987 (fr.), A . Nilson s.n. ( MBM153679 ). Mun. Farroupilha, 11 December 1999 (fl.), A . Kegler 452 ( US). Mun. Flores da Cunha, 25 January 1999 (fl.), A . Kegler 133 ( US). Mun. Porto Alegre, November 1945 (fl.), K . Emrich s.n. ( PACA32850 ); ibidem, 6 December 2005 (fl.), V. F . Kinupp 3071 ( ICN). Mun. São Marcos , 7 December 1999 (fl.), A . Kegler 434 ( US); ibidem, 17 December 2012 (fl.), M . Grizzon 127 ( MBM). Mun. Vacaria , 6 August 1998 (st.), J . Mauhs s.n. ( PACA94102 ). Mun. Veranópolis, 29 December 1981 (fl.), N . Silveira 132 ( RB). Santa Catarina: Mun. Alfredo Wagner, 6 April 2018 (fr.), A . Kassner-Filho 2581 ( RB). Mun. Anita Garibaldi , 11 December 2008 (fl.), A . Stival-Santos 232 ( ESA, FURB, SPF); ibidem, 11 November 2006 (fl.), C. A . Dalmaso s.n. ( MBM345076 ). Mun. Anitápolis, 14 December 1972 (fl.), R. M . Klein 10595 ( HBR, MBM); ibidem, 15 December 1972 (fl.), R. M . Klein 10613 ( HBR). Mun. Caçador , 23 December 1956 (fl.), L. B . Smith 9090 ( HBR, NY, US); ibidem, 6 February 1957 (fr.), L. B . Smith 10878 ( HBR, NY, US). Mun. Campo Alegre, 15 January 1974 (fl.), R. M . Klein 11001 ( HBR, MBM, US); ibidem, 9 January 1958 (fl.), R . Reitz 6006 ( HBR, US). Mun. Florianópolis , November 1970 (fl.), A . Bresolin 44 ( HBR, ICN); ibidem, 22 January 1980 (fr.), A . Bresolin 1387 ( HUEFS); ibidem, 20 December 1966 (fl.), R. M . Klein 6950 ( HBR, ICN, PACA); ibidem, 19 December 1967 (fl.), R. M . Klein 7684 ( HBR, MBM). Mun. Lages , 10 January 1951 (fl.), B . Rambo 49550 B ( HBR, S); ibidem, 10 January 1951 (fl.), B . Rambo s.n. ( PACA49564 ); ibidem, 15 January 1957 (fl.), L. B . Smith 10089 ( HBR, US); ibidem, 16 December 1967 (fl.), A . Lourteig 2172 ( HBR); ibidem, 16 December 1967 (fl.), A . Lourteig 2272 ( P, US). Mun. Lauro Müller , 5 December 1946 (fl.), R . Reitz C1711 ( HBR). Mun. Mafra , 4 January 1962 (fl.), R . Reitz 11525 ( HBR). Mun. Otacílio Costa , 10 February 1996 (fr.), O. S . Ribas 1198 ( ESA, INPA, M, MBM, SP, SPF). Mun. Papanduva , 3 January 1962 (fl.), R . Reitz 11393 ( HBR, MBM, NY, US). Mun. Rio Negrinho , 20 January 2009 (fl.), D. B . Falkenberg 11118 ( RB). Mun. São Bento do Sul, 15 December 2013 (fl.), P . Schwirkowski 25 B ( MBM) .

Figures

FIGURE 21. A–E. Myrcia hatschbachii. A. Vegetative branch. B. Sympodial branching with short node and deciduous cataphylls. C. Leaf showing reticulate venation. D. Flowering branch. E. Flowers at anthesis; note the capitate stigma. F–H. Myrcia oblongata. F. Habitat in disturbed vegetation between a road and forest fragment (Capão Alto, Santa Catarina state, Brazil). G. Glaucous abaxial leaf surface. H. Fruiting branch. Image credits: C–E) Eduardo Lozano.

FIGURE 22. Representative specimens of Myrcia sect. Eugeniopsis: Myrcia hatschbachii (Kummrow 1648 [MBM]).

FIGURE 23. Distribution of Myrcia hatschbachii (triangles) and Myrcia teuscheriana (circles). Solid lines represent the boundaries of South American countries and Brazilian states. The grayscale reflects elevation.