Peltogyne gracilipes Ducke, Trop. Woods

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 : 36-39

12. Peltogyne gracilipes Ducke, Trop. Woods 54: 6. 1938.

Holotype:— BRAZIL. Roraima: Serra Grande , 1 January 1937, A. Ducke RB35151 (Holotype: RB!; Isotypes: F, IAN!, K, MO, NY, P, U, US). Fig 17 .

Tree, 20–38 m tall, bark smooth, grayish, branches rough and lenticellate, grayish, stipules early deciduous. Leaflets elliptic, falcate, 5–7.5 × 2.5–3 cm, base oblique, apex acute, glabrous, wax absent on both surfaces, discolorous, petiole 8–12 cm long, petiolule 1–2 mm long, blade decurrent, pulvinus dilated, primary vein conspicuous abaxially, secondary veins conspicuous on both sides, glands present. Inflorescence a panicle, terminal, laxiflorous, rachis velutinous, 10– 15 cm long, inserted in a non-aphyllous branch. Pedicel 1–3 mm long, bracteoles caducous, hypanthium absent. Bud 3 × 3 mm, sepals orbicular to deltoid, outer side pubescent, inner side glabrous, glands present on the adaxial side, petals elliptic, sessile, glabrous, glands present. Stamens of different sizes, antesepalous filaments 2–3 mm long, antepetalous filaments 1–2 mm long. Stipe pilose on the abaxial side, 1 mm long. Ovary semicircular, glabrous, margin with sparse trichomes, 1–3 mm long, style with subterminal insertion, 2.5–4 mm long. Fruit a legume, dehiscent, subtriangular, without a protuberance, margin straight, compressed, 2.8 × 1.5 cm, stipitate, nectary disc not persistent, glabrous, glands present, veins present, not winged.

Phenology —Collected in flower in June and July and in fruit between February and May.

Distribution and habitat— Peltogyne gracilipes is an Amazonian species endemic to the island of Maracá, in Roraima, where it is found in monodominant formations ( Lewis & Owen 1989) ( Fig 5 ).

Taxonomic comments— Peltogyne gracilipes is a large tree (20–38 m) with elliptic, falcate leaflets and flowers with a slender, delicate pedicel and is restricted to the Amazon. Ducke (1949) described it as similar to P. pauciflora , since both of them have relatively small leaflets with an oblique base, but P. pauciflora is a tree of a smaller size (3–12 m) and has oblong and not falcate leaflets.

Etymology—gracilis, graceful or slender; pes= feet. The name alludes to the shape of the pedicel.

Specimens examined — BRAZIL. Roraima: (Boa Vista) Rio Branco, Serra Grande, 01 July 1937, A. Ducke 518 ( R); Mata das contrafortes, 01 July 1937, A. Ducke RB 35151 ( RB!); BR 174.49 km, entre Vila Pacaraima e Boa Vista, 15 September 1993, I. S. Miranda 165 ( UB) E. E. Ilha de Maracá, 01 August 1992, M. T. Nascimento 52 ( INPA !); 01 September 1992, M. T. Nascimento 54 ( INPA !); Ilha Nova Olinda, próxima a casa de Maracá, 01 December 1992, M. T. Nascimento 59 ( INPA !); Furo Apuí, 01 November 1992, M. T. Nascimento 58 ( INPA !); 01 October 1992, M. T. Nascimento 57 ( INPA !); 03 July 1992, M. T. Nascimento 59 ( RB!); February 1988, Robert 579 ( INPA !); 24 March 1948, R. L. Fróes 23116 ( RB!, IAC!, IAN!); 18 February 1979, J. M. Pires 16714 ( RB!).

Digital images — BRAZIL. Roraima: Rio Branco, Serra Grande , 01 July 1937, A . Ducke 518 ( K); Reserva Ecológica de Maracá, Furo de Maracá , 11 October 1987, G. P . Lewis 1653 ( K, NY); Maracá, Near Igarapé camp. Fumaca Trail , SEMA ecological reserve, Ilha de Maracá , 26 October 1988, J. A . Ratter 5893v, ( K); SEMA Ecological Reserve, Ilha de Maracá , area near Casa de Maracá , 30 April 1987, W . Milliken 159 V, ( K); 27 April 1987, W . Milliken 100 V ( K, NY); W . Milliken 399 ( K, NY) .

Vernacular names —Pau-roxo.

Figures

FIGURE 5. Distribution map of species of Peltogyne in solid ground, relatively far from floodplains in the Amazon.

FIGURE 17. Peltogyne gracilipes Ducke. A, branch with leaflets, and inflorescence (scale: 5 cm). B, flower bud in pre-anthesis (scale: 5 mm). C, stamens (scale: 1 mm). D, fruit, and seed (scale: 1 cm). Illustrated by Fábio Júnior Kochanovski.