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A shrub. It has thick stems. It grows 2 m high. It floats in deep water and roots in the soil in shallow water. Young stems are slightly hairy. The leaves have 24-80 leaflets. The leaflets are 5-25 mm long by 1-5 mm wide. There are very fine teeth along the edge. There are 3-8 flowers in a group in the axils of leaves. The standard is yellow. The fruit is a pod 2-9 cm long. It is narrow and straight. It has 4-9 joints. The seeds are dark reddish-brown. They are 7 mm long by 4 mm wide and 1 mm thick.
Leaves 24–80-foliolate; leaflets 5–25 × 1–5 mm, linear or linear-oblong, rounded and mucronulate at the apex, oblique at the base, entire or very finely serrulate, margins often ciliolate, glabrous; venation obscure; petiole and rhachis 4–20 cm long, slightly pubescent with tubercular-based hairs; petiolules 0.5 mm long; stipules 5–20 × 1–4 mm, lanceolate, straight, spurred, at length deciduous.
Fruit 2–8.5 cm long excluding the 0.8–1.5(2) cm stipe, linear, straight, 4–9-jointed, glabrous, the margins straight or slightly constricted between the joints; articles 8–10 × 6–7 mm, rounded-oblong, compressed, at first venulose, later often sparsely and finely verrucose.
Inflorescences axillary, 3–8-flowered, peduncle up to 2 cm long, pubescent with tubercular-based hairs; rhachis 1–8 cm long; pedicels 0.5–1(2.3 in fruit) cm long; bracts 3–6 × 2–3 mm, ovate; bracteoles 3–8 × 2–4.5 mm, ovate-elliptic, ciliolate.
Standard yellow or greenish-yellow, 11–25 × 1–28 mm, rounded, emarginate, crenellate, glabrous; wings greenish-yellow, irregularly crenellate; keel petals greenish or brown, laciniate along their lower margins.
Shrubby herb or small shrub, 1–2.5 m tall, floating in deep water but rooting in the soil when in shallow water, the lower stems thick, hollow, covered densely with adventitious roots and black tubercles.
Calyx glabrescent or somewhat pubescent with tubercular-based hairs, 2-lipped; lips 7–13 × 3–6 mm, oblong, somewhat unequal, one entire or slightly emarginate, the other 3-lobed.
Seeds dark reddish-brown, 7 × 4 × 1 mm, compressed ellipsoid-reniform; hilum 3 mm long, oblong, the seed-end canoe-shaped beyond it.
Young stems slightly pubescent or glabrescent, but soon becoming almost or quite glabrous.
Stem thick and pithy up to 5 ft.
Flowers yellow
