Vigna richardsiae Verdc.

Twining or procumbent herb, ± 1·5 m. long.. Stems slender, somewhat angular, practically glabrous.. Leaflets 3, narrowly lanceolate to ovate, 1·5–5 cm. long, 0·4–2·8 cm. wide, acute to sharply acuminate, rounded at the base, glabrous or very sparsely pilose on both surfaces; petiole 1·5–5 cm. long; rhachis 0·2–1 cm. long; petiolules 0·5–2 mm. long; stipules reflexed, lanceolate, 2–4 mm. long, 3-nerved, not or scarcely at all prolonged below the base.. Inflorescences axillary; rhachis 0·5–1 cm. long, 1–7-nodose, the flowers in 3–5-flowered fascicles at the nodes; peduncle 1–6·5 cm. long, angled or almost winged; pedicels 2–4 mm. long; bracts ovate, 1 mm. long, deciduous; bracteoles oblong-cucullate, just over 1 mm. long, at length deciduous.. Calyx-tube ± 2·5 mm. long, glabrescent; lobes deltoid or ovate, 1–1·5 mm. long, ciliate, the upper pair joined to form a rounded emarginate lip.. Flowers yellow or mauve; standard oblate, 1 cm. long, 1·2–1·3 cm. wide, emarginate, glabrous; keel obtuse at apex, not incurved.. Pod (known from single immature detached valve) linear, 4 cm. long, 4–4·5 mm. wide, glabrous or minutely puberulous, 6–10-seeded.. Seeds not known.