Vigna heterophylla A.Rich.

Annual or perennial climbing, scrambling or sometimes even suberect herb, ± 1 m. long.. Stems covered with spreading, often dark ferruginous hairs.. Leaflets 3, ovate to narrowly oblong-lanceolate or lanceolate, 1·7–8·5 cm. long, 0·5–3·3 cm. wide, narrowly rounded to acute and acuminate at the apex, rounded at the base, pubescent on both surfaces; petiole 1–6 cm. long; rhachis 0·4–1·3 cm. long; petiolules 2–3 mm. long; stipules ovate-lanceolate, 3–4 mm. long, bilobed at the base.. Inflorescences axillary; rhachis 0·7–2 cm. long; peduncles 1–10 cm. long; pedicels 1–4 mm. long; bracteoles sub-persistent, lanceolate, 3 mm. long, slightly produced below the point of attachment.. Calyx pubescent with mostly dark ferruginous spreading bristly hairs; tube 2–2·5 mm. long; lobes narrowly triangular-lanceolate, 3–4 mm. long, the upper pair united into a slightly bifid lip.. Standard blue or violet, sometimes tinged green outside, rounded, 1·1 cm. long, 1·2 cm. wide, adpressed velvety outside; wings deep mauve; keel almost white.. Pods linear, compressed, 1·5–4·3 cm. long, 4·5–6 mm. wide, densely covered with spreading, dark ferruginous bristly hairs, particularly noticeable when young.. Seeds stone-grey to dark reddish-brown, with black mottling, longest dimension 4 mm., shorter dimension 2·5–3 mm., 2 mm. thick; aril very eccentric, usually shorter and more cordate than in the next species.

It is a tropical plant. It grows in dry areas. It grows in savannah woodland. It grows in grassland between 1,680-2,010 m above sea level. It can grow in arid places.

The root tubers have been recorded as eaten. Caution: There are some comments about toxicity.