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A shrub. It grows 2 m tall. The branches are angled with ribs along them and are hairy. The leaves have 3 leaflets. The leaflets are narrowly oval and 6-10 cm long by 1-2 cm wide. They are hairy underneath. There are 10-20 flowers together at the ends of the branches. The flowers are yellow. The pod is 3-4 cm long by 0.7-1.2 wide. There are 50-70 seeds. The seeds are a dull orange. They are 2.2-2.8 mm long.
Standard elliptic to obovate-elliptic, yellow, veined reddish-purple outside; wings ± as long as the keel, with a dark mark at the base; keel 1.2–1.4 cm long, shortly rounded about the middle, with a sharp slightly incurved beak.
Leaves 3-foliolate, estipulate; leaflets mostly (4.5)6–14 × 1–4 cm, lanceolate to elliptic-oblong, lower ones sometimes elliptic, appressed puberulous beneath, rarely also above; petioles shorter than the leaflets.
Calyx 4–6 mm long, becoming basally truncate and deflexed against the pedicel, glabrous or rather thinly appressed puberulous; lobes generally reduced to small widely spaced subulate teeth.
Racemes up to 30–40 cm long, many-flowered; bracts (1)2–4 mm long, linear-caudate; bracteoles inserted at the base of the calyx or immediately below, slightly smaller than the bract.
Erect annual or short-lived perennial, up to 0.7–2.7 m tall, well branched at least above; branches ribbed, appressed puberulous.
Pod (3.2)3.5–4.5 × 0.7–1.2 cm, shortly stipitate, subcylindrical, appressed puberulous, 50–70-seeded.
Seeds 2.2–2.8 mm long, oblique-cordiform, smooth, orange-buff or terra-cotta.
