Peltogyne mattosiana Rizzini, Revista

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 : 45

16. Peltogyne mattosiana Rizzini, Revista Brasil. Biol. 31: 195. 1971.

Holotype:— BRAZIL. Rio de Janeiro, Santa Maria Madalena, Área do Horto Frutícola Santos Lima , 19 March 1955, E. Pereira 1272 (Holotype: RB!; Isotype: INPA !). Fig 21 .

Tree 4–18 m tall, bark smooth, lenticellate, brown, branches longitudinally scaly, lenticellate, stipules early deciduous. Leaflets elliptic, falcate, 6–9 × 3–4 cm, base attenuate, apex acute, slightly retuse, glabrous, wax absent on both surfaces, concolorous, petiole 10–15 mm long, petiolule 2–4 mm long, blade decurrent, pulvinus dilated, primary vein inconspicuous adaxially and conspicuous abaxially, secondary veins conspicuous on both sides, glands absent. Inflorescence a panicle, terminal, laxiflorous, rachis glabrous, 7–11 cm long, inserted in a non-aphyllous branch. Pedicel 3–5 mm long, bracteoles caducous, hypanthium absent. Bud 3–4 × 4–5 mm, sepals orbicular to deltoid, outer side pubescent, inner side glabrous, glands present, petals elliptic or slightly oblanceolate, sessile, glabrous, glands absent. Stamens of different sizes, antesepalous filaments 4–5 mm long, antepetalous filaments 3–4 mm long. Stipe glabrous, 1 mm (or less) long. Ovary semicircular, glabrous, 2–3 mm long, style with subterminal insertion, 3–4 mm long. Fruit a legume, dehiscent, orbicular, without a protuberance, compressed, 2.8–3 × 2–2.5 cm, stipitate, nectary disc not persistent, glabrous, glands present, veins absent, not winged.

Phenology —Collected in flower from November to December and in fruit between December and January.

Distribution and habitat— Peltogyne mattosiana is restricted to the Atlantic Forest, mainly to mountains in the state of Rio de Janeiro and southern Minas Gerais ( Fig 3 ).

Taxonomic comments— Peltogyne mattosiana can be distinguished by its glabrous petiole, attenuate leaflet base, acute (sometimes acuminate) apex, concolorous leaves, and dehiscent legume. It is commonly confused with P. discolor , which occurs in the Southeast of Brazil, due to the elliptic leaflets and the size of the flowers and buds, and the orbicular fruits. In P. discolor , however, the petiole is pilose, the leaflets have an oblique base, and an emarginate apex, and the legume is indehiscent.

Etymology— mattosiana , from Mattos, a tribute to the anatomist Armando de Mattos Filho.

Specimens examined — BRAZIL. Minas Gerais: Imbé , 29 October 1997, M. R. M . Loreno RB354073 ( RB!); 15 October 1997, M. R. M . Loreno RB354117 ( RB!); 19 November 1997, M. R. M . Loreno RB354116 ( RB!); 14 March 1998, M. R. M . Loreno RB354118 ( RB!) ; Rio de Janeiro: Jardim Botânico do Rio de Janeiro, Cant. 32, Seção E , em frente da Botânica Sistemática , 19 February1965, H. C . De Lima 4999 ( RB!); 15 September 1993, H. C . de Lima 4944 ( SP RB!); 26 February 2015, E . Córdula 1081 ( RB!); 29 August 1991, V. F . Gonçalves RB446831 ( RB!); Santa Maria Madalena, 02 June 1970, Rizzini RB144698 ( RB!); Área do Horto Frutícola Santos Lima , 19 March 1955, E . Pereira 1272 ( SP, INPA !, RB!); Silva Jardim, Estrada do Aristides , Reserva Biológica de Poço das Antas , 12 July 1994, H. C . de Lima 4930 ( RB!) .

Digital images — BRAZIL. Rio de Janeiro : Rio de Janeiro, Jardim Botânico do Rio de Janeiro, canteiro 32, em frente da Botânica Sistemática, 15 September 1993, Rizzini 4944 ( K); Canteiro 32, Seção E, em frente da Botânica Sistemática, 19 February 1965, H. C. Lima 4999 ( K) .

Vernacular names —Roxinho, Rouxinho, Guaralau, Rouxinho do Guaralau.

Figures

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

FIGURE 21. Peltogyne mattosiana Rizzini.A, branch with leaflets, and inflorescence (scale: 5 cm). B, flower bud in pre-anthesis (scale: 5 mm). C, sepal (scale: 3 mm). D, petal (scale: 3 mm). E, stamens (scale: 3 mm). F, carpel, and style in pre-anthesis (scale: 1mm). G, fruit (scale: 1 cm). Illustrated by Fábio Júnior Kochanovski.