9. Centrosema sagittatum (Humboldt & Bonpland ex Willdenow 1809: 757) Brandegee (1905: 202) . (Fig. 3d)

Vines, branches glabrous, inermous. Nectary absent. Stipules lateral, triangular. Leaves imparipinnate, 1–3– foliolate, opposite, sagittate, venation brochidodromous, translucid punctuation absent absent. Inflorescence raceme, axillary. Flowers pedicellate, zygomorphic, diplostemonous; calyx gamosepalous, sepals 5, corolla dialypetalous, papilionaceous, whitish, petals 5; androecium diadelphous, heterodinamous, anthers longitudinal; ovary superior, sessile, pluriovulate. Fruit legume, sessile, linear, plane, margin straight, epicarp glabrous, whitish. Seeds reniform, plane, coat marbled, hilum central.

Examined material:— BRAZIL. Paraíba: Maturéia, Pico do Jabre, 900 m elev., 13 May 2019, fl., Aureliana Gomes 2096 (HACAM) .

Distribution and ecology:— The species has distribution in South America, among secondary vegetation (Lima & Mansano2011).In Brazil, it is present in the Central-West,Northeast, Southeast and South regions in the phytogeographic domains of Caatinga, Cerrado, Atlantic Rainforest and Pantanal, in rocky fields, seasonal semideciduous forest, rain forest and in sandbank areas (INCT - Virtual Herbarium of Flora and Fungi). This species occurs preferably in the undergrowth of the forest (Queiroz 2021).

Phenology:— Found with flowers in May.

Centrosema sagittatum can be easily recognized, mainly, by the vine habit, 1–3 foliolate imparipinnate leaves, opposite, sagittate leaflets, dialypetalous corolla, papilionaceous, whitish and reniform seeds.