Peltogyne discolor Vogel, Linnea

Kochanovski, Fabio J., Nogueira, Luan H. P., Rosa, Marcus P. G., Mansano, Vidal F. & Sartori, Ângela L. B., 2025, Taxonomic review of the genus Peltogyne Vogel (Leguminosae, Detarioideae), Phytotaxa 688 (1), pp. 1-68 : 32-34

9. Peltogyne discolor Vogel, Linnea 11: 410. 1837.

Holotype:— BRAZIL. Rio de Janeiro: Majé, Serra dos Órgãos, s.d., B. Luschnath BR 5202737 (Presumable holotype: BR). Fig 14 .

= Cynometra riedeliana Harms (1928:209) . Rio de Janeiro , Serra do Corcovado, December 1832, L. Riedel e B. Luschnath 1182 (Syntypes: K, RB! US).

≡ Peltogyne riedeliana (Harms) Dwyer (1959:342)

Tree, 9–20 m high, bark peeling off in plates or scales, a brownish color exposed below the plates, branches striate and scaly, lenticellate, brownish, stipules early deciduous. Leaflets elliptic, not falcate, 3–5 × 2–2.5 cm, base oblique, apex emarginate, glabrous, wax absent on both surfaces, discolorous, petiole 4–10 mm long, highly pilose, petiolule 1–2 mm long, blade decurrent, pulvinus dilated, primary vein inconspicuous adaxially and conspicuous abaxially, secondary veins conspicuous on both sides, glands absent. Inflorescence a panicle, subterminal, laxiflorous, rachis velutinous, 3.5–5 cm long, inserted in a non-aphyllous branch. Pedicel 2–5 mm long, bracteoles caducous, hypanthium absent. Bud 3–4 × 3–4 mm, sepals orbicular to deltoid, outer side velutinous, inner side glabrous, glands present, petals elliptic to orbicular, sessile, glabrous, glands present. Stamens of different sizes, antesepalous filaments 3–3.5 mm long, antepetalous filaments 1–2 mm long. Ovary semicircular, commonly D-shaped, tomentose, 2–3 mm long, style with terminal insertion, 2 mm long. Fruit a legume, indehiscent, orbicular, without a protuberance, compressed, 2–3 × 1.8–2.5 cm, stipitate, nectary disc not persistent, glabrous, glands present, veins present, winged.

Phenology —Collected in flower in September to October and in fruit in May.

Distribution and habitat— Peltogyne discolor is endemic to the state of Rio de Janeiro, occurring in montane forests or more rarely in restingas ( Fig 3 ).

Taxonomic comments— Peltogyne discolor , the type species of the genus, is distinguished from the other species by having one of the smallest leaflets (3–5 cm long) with an oblique base and a pilose petiole. P. discolor is sometimes confused with P. pauciflora , but it can be clearly distinguished from it by its glabrous, elliptic leaflets with an emarginate apex, early deciduous stipules, and orbicular fruits, while P. pauciflora has obovate leaflets with a pilose base, persistent stipules, and oblong fruits. Silva (1976) mentioned P. discolor as occurring in the state of Rio de Janeiro and southern Bahia. However, the analysis of the specimen collected by Curran 74 (RB!, US (scanned image) showed that the material consists of only a young branch and fruit. Despite the deficient material, it is possible to see that the specimen is P. chrysopis , later described by Barneby (1994), and the defficient sample may have contributed to the misidentification by Silva (1976).

Etymology— discolor , another color. It refers to the different colors of the abaxial and adaxial sides of the leaflets.

Specimens examined — BRAZIL. Rio de Janeiro: Armação dos Búzios, Bausen Club, próximo a estrada do condomínio do Lago, 09 July 1996, H. C . de Lima 5440 ( RB!); Armação dos Búzios, Ferradura, 19 February 2004, H. G . Dantas 160 ( RB!); Mata De José Gonçalvez , vizinha à Faz. Rancho 10, 13 February 1997, P. R . Farág 562 ( RB!); Estrada Búzios-Cabo Frio, São Miguel-Rancho 10 e Búzios Mega Resort Hotel , 05 May 2004, R . D. Ribeiro 224 ( RB!); Cabo Frio, estrada da Rasa, codomínio Bausen Club, praia de Caravelas , 28 June 1997, H. C . de Lima 5421 ( RB!); 26 February 1996, H. C . de Lima 5307 ( RB!); Próxima ao Condomínio Dunas do Peró , Restinga arbórea, 16 March 1995, H. C . de Lima 5017 ( RB!); Serra das Emerêcias, caminho para ponto das Emergências, 19 October 1993, H. C . de Lima 4807 ( RB!); Maricá, Pindobas, Estrada do Camburi , antes da plataforma de voo-livre, fragmento de mata de morrote, 27 June 2016, H. C . de Lima 8261 ( RB!); Pedra de Guaratiba, APA Capoeira Grande, picada ao lado da escola, Mata seca sobre colina, Área de Proteção Ambiental da Capoeira Grande , 05 May 2012, H. C . de Lima 7465 ( RB!) ; Rio de Janeiro, Campo Grande, February 1845, F . Freire-Allemão R67009 ( R) ; Rio de Janeiro, Fazenda Santa Branca, 1930, R ! 21346 ( R, INPA !); Jardim Botânico do Rio de Janeiro, canteiro 27- D. Jardim Botânico do Rio de Janeiro, 26 October 2005, L. F. G . da Silva 85 ( RB!); Jardim Botânico , 26 November 1993, D. M . Tourinho ( RB!); Mata da Fabrica Aliança Laranjeira , 18 November 1927, J. G . Kuhlmann 22 ( RB!); Morro São João , vertente para Copacabana, próximo a base Aulhinho Itanhangá, 16 December 2005, H. C . de Lima 6392 ( UEC!, RB!); Mundo Novo, Botafogo , 19 July 1920, J. G . Kuhlmann 15330 ( IAN!); Serra do Corcovado , December 1832, S . Riedel 1182 ( RB!); São Pedro da Aldeia, Morro dos Milagres , 28 March 2004, H. C . de Lima 6173 ( RB!); Floresta Estacional Semidecídua , Vertente Norte, 25 August 2000, C. S . Farney 4971 ( RB!); Mata de encosta, 03 December 2001, C. S . Farney 4451 ( RB! SP); Vertente S , aproximadamente 290 320 M . S.M. Porção final da Serra (Sudeste), 12 September 2000, C. S . Farney 4198 ( RB!) .

Digital images — BRAZIL. Rio de Janeiro : Rio de Janeiro, ad urbem loco Mundo Novo , 19 December 1920, J. G. Kuhlmann 15330 ( K); Estrada Búzios-Cabo Frio, São Miguel-Rancho 10 e Búzios Mega Resort Hotel, 05 May 2004, R. D. Ribeiro 224 ( NY) .

Vernacular names —Guarabu, Guaralau.

Figures

FIGURE 3. Distribution map of species of Peltogyne in the Atlantic Forest.

FIGURE 14. Peltogyne discolor Vogel. A, branch with leaflets (scale: 5 cm). B, part of the inflorescence (scale: 2 mm). C, flower bud in pre-anthesis (scale: 3 mm). D, flower in anthesis, stigma absent (scale: 3 mm). E, petal (scale: 2 mm). F, stamens (scale: 3 mm). G, hypanthium with carpel (scale: 3 mm). H, carpel in longitudinal section (scale: 3mm). I, fruit. Illustrated by Fábio Júnior Kochanovski.