Discolobium, Bentham, 1837

Sartori, Ângela Lúcia Bagnatori, Neves, Ianny Marques, Seleme, Elidiene Priscila & Mansano, Vidal De Freitas, 2017, A taxonomic revision of the South American genus Discolobium (Leguminosae, Papilionoideae), Phytotaxa 308 (1), pp. 1-19 : 4

Key to the species of Discolobium

1. Branch chestnut brown, stipules up to 4 mm long; vexillum suborbiculate or large-elliptic ........................................................... 2

- Branch vinaceous, dark brown to grayish, stipules more than 4.3 mm long; vexillum large-obovate or obovate .......................... 4

2. Branch with glandular trichomes, stipules lanceolate to lanceolate-triangular ............................................... 4. D. psoraleaefolium

- Branch without glandular trichomes, stipules linear or linear-triangular ......................................................................................... 3

3. Stipules 3 mm long, rachis grooved, bract ovate-lanceolate, bracteole lanceolate-linear to triangular; vexillum with apex obcordate ..................................................................................................................................................................... 2. D. junceum

- Stipules 4 mm long, rachis not grooved, bract lanceolate, bracteole lanceolate; vexillum with apex retuse ......... 6. D. tocantinum

4. Leaflets oblong-linear, stipules 4.5 mm long; vexillum obovate ........................................................................... 3. D. leptohyllum

- Leaflets large-elliptic, elliptic or obovate, stipules at least 5 mm long; vexillum large-obovate ..................................................... 5

5. Branch vinaceous, leaflet 3.5-6.5 mm wide, seminiferous region with margin densely tuberculate ............................. 1. D. hirtum

- Branch grayish to dark brown, leaflet 0.2-1.3 mm wide, seminiferous region with margin sparsely tuberculate .. 5. D. pulchellum