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Standard yellow or orange, speckled dark purple or reddish, 1.2–1.6(1.8) × 1.1–1.4(1.5) cm, the blade suborbicular, apically emarginate, the appendages with short triangular upward-pointing or slightly incurved free tips less than 1 mm long; wings yellow, 1.3–1.6(1.7) cm × 3.5–5 mm, the small, triangular tooth and the upper margin of the basal half of the blade together characteristically inrolled, lamellate sculpturing in upper basal section on outer face; keel yellow to pale greenish, 1.2–1.5(1.7) cm × 6.5–9 mm, basal tooth short, triangular, slightly upward-pointing with a small, 3–4 mm long, pocket below it on inner face of the blade.
Leaves (4.6)7–25.5 cm long, the rachides sparsely pilose;petioles 3–8 mm long, sparsely to densely pilose; leaflets opposite or sometimes alternate in (6)12–24(27) pairs, 0.9–3.5 cm × 2–10 mm, the basal pair usually smaller than the rest, sometimes 5 × 3 mm, oblong, rounded to obtuse to slightly emarginate at the apex, apiculate, glabrous above or rarely with an occasional hair on the midrib, usually sparsely pilose on margins and midrib beneath; stipules 5–10 mm long, linear-lanceolate to lanceolate, reflexed, pilose, rather persistent.
An annual herb. It grows 1.5 m high. It is softly woody. It can live for a few years. The stems are 15 mm thick. The leaves have 12-22 pairs of leaflets along the stalk. These are 3 cm long and 6 mm wide. There are 3-15 flowers in a group. They are yellow. The fruit is a curved pod 15-22 cm long. It has a slender beak. The seeds are oval and 4 mm long by 3 mm wide. They are brown with small purple dots.
Racemes axillary, shorter than the subtending leaf, (0.5)1–5.9 cm long, the rachis pilose, (1)3–12(15)-flowered; peduncle (0.2)0.4–1.5(2.2) cm long, pilose especially at the base; pedicels 0.4–1.5(1.9) cm long, sparsely pilose; bracts and bracteoles linear to linear-lanceolate, sparsely pilose, caducous, the bracts 5–8 mm long, the bracteoles c.5 mm long.
Pod 15–22 cm long (including a slender beak 1.5–3.5 cm long), 3.5–5 mm wide, erect, falcate, distinctly thicker at the centre than at the sutures, the central areas on mature fruits with prominent venation, this sometimes interspersed with red blotching or dark red warts, glabrous, (13)24–51-seeded; septa 3.5–4.5(5) mm apart.
Stems pithy, sparsely pilose at first, later glabrescent with vertical rows of pustules usually evident above the leaf axils and producing warty outgrowths on older stems, submerged portions clothed with matted fibrous roots.
Seeds brown, greenish or dark reddish-brown, 3–3.5 × 2.5–3 mm, 2–2.5 mm thick, ± cube-shaped to subcylindrical, the hilum in a small central circular pit.
Calyx 5–7.5 × 4–5 mm, sparsely pilose, the teeth 1–2 mm long, subulate, sparsely pilose.
An erect, robust, softly woody, non-aculeate annual or biennial herb, 1–3 m tall.
Ovary sparsely pilose on upper margin or glabrous; style glabrous.
