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A herb or shrub. It grows 1-3 m tall. It has soft pithy stems. The leaves have 36-100 leaflets. The leaflets are 8-22 mm long by 1.5-3.5 mm wide. There are 2-4 flowers in the axils of leaves. The fruit is 5-9 cm long and dark. It can be slightly curved and has 6-10 joints. The seeds are brown and 6 mm long by 4 mm wide and 2 mm thick. They are curved up at one end.
Fruit dark, 5–9 cm long excluding the 0.7–1.4 cm long stipe, linear, straight or slightly curved, 6–10-jointed, the margins ± straight or distinctly wavy, thickened and verrucose when adult; articles (7)8–12 × (6)7–8.5 mm, oblong, flat, veined when immature, then finely muricate over the entire surface when quite adult.
Inflorescence axillary, (1)2–4(6)-flowered; peduncle 1.3–4 cm long; pedicels 5–10 mm long, with short stiff hairs; bracts 4–8 × 2–3 mm, ovate, ciliate, but otherwise glabrous; bracteoles 3–7 × 1.6–3 mm, ovate or lanceolate, ciliolate.
Standard yellow or greenish, 9–12 × (6)7–10 mm, elliptic, obovate or round; wings and keel yellow, the petals of the latter laciniate along their lower margins and pubescent outside.
Seeds pale to blackish-brown, 6 × 4 × 2 mm, compressed oblong-ellipsoid, beaked beyond the hilum at one end so as to resemble the prow of a canoe.
Calyx glabrous or pubescent, 2-lipped; lips (5)6–9 × 3–4.5 mm, oblong, one slightly 2-fid the other 3-fid.
Stems hollow, thick and with abundant pith at the base, glabrous.
Shrub or shrubby herb 1–3 m tall.
Soft pithy stems, 3–6 ft. high
An undershrub
