Vines annual. Stems green to grayish brown, trailing, climb­ing, or erect, ribbed, hollow in age, hispid, with brown, spread­ing hairs. Leaves: stip­ules widely ovate, distinctly pel­tate, 8–12 mm, ciliate; petiole 5–21 cm; rachis 2.5–4 cm; stipels lanceolate, 4–7 mm; leaflet blades ovate to widely ovate or lanceolate, 5–16 × 3–12 cm, base broadly cuneate or rounded, lateral ones oblique, apex acuminate, surfaces sparsely pilose. Peduncles to 20 cm. Inflorescences: floral nodes 2–12, clustered distally; bracts deciduous, ovate-triangular, 3 mm. Pedicels arcuate, 1–2 mm; bracteoles deciduous, striate, linear-lanceolate or oblong, 5 mm. Flowers: calyx tube 3–4 mm, lobes triangular, 1 mm; corolla grayish yellow, 10–12 mm; banner yellow-green outside, suboblate, 12 × 16 mm, auriculate; wings yellow, ovate; keel green tinged with red, falcate and incurved through 1 circle, with lateral keel-pocket or hornlike appendage supporting left wing petal; style incurved, elongate-beaked, lobelike appendage extending beyond stigma into slender tip. Legumes spreading, yellowish brown, becoming black, linear, terete, 4–9 × 0.6 cm, beak straight, short, shortly hispid, hairs pale brown. Seeds 8–15, greenish or yellow-brown, often mottled black or green, globular to oblong or shortly cylindric, 2.5–4 × 2.5–3 mm; hilum not raised, rim-aril not raised.

Phenology: Flowering late spring–early summer.
Habitat: Sandy soils next to riverbanks.
Elevation: 50–100 m.

Distribution

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Introduced; Va., se Asia, introduced also in Africa.

Discussion

Selected References

None.

Lower Taxa

None.