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Standard dark yellow with purple flecks and spots on outer face (sometimes without the purple markings on plants outside the Flora Zambesiaca area), 1.6–2.8 × 1.6–2.4 cm, suborbicular, deeply emarginate, appendages with free tips 3–4 mm long; wings yellow, 1.6–2.4 cm × 7–9 mm, with an obscure broadly-triangular upper basal tooth and prominent lamellate sculpturing in upper basal half on outer face; keel greenish-yellow, 1.6–2.4 cm × 8–10 mm, the basal tooth triangular, ± horizontal.
Leaves (0.7)1.5–5.6 cm long; rachis pubescent; petioles 1.5–5 mm long, pubescent; leaflets in (3)4–8(12) pairs, (0.5)1–1.8 cm × (2)3–5 mm, oblong to oblong-elliptic, rounded to obtuse to emarginate at the apex, minutely apiculate, tapering to an asymmetrical base, pubescent on both surfaces; stipules 2–4 mm long, triangular-lanceolate to triangular-ovate, pubescent, caducous.
Raceme axillary, 0.5–2.7 cm long, 1–2(rarely 4)-flowered, the rachis pubescent; peduncle 0.5–2 cm long, pubescent; pedicels (3)5–6(9) mm long, pubescent; bracts and bracteoles linear-lanceolate, caducous to rarely persistent, the bracts 3–4 mm long; bracteoles 1.5–2 mm long.
Pod 14–21.5(26) cm × (2)4 mm, ± linear, slightly torulose, thicker at the centre than the margin, sometimes with prominent fracturing at right angles to the sutures when mature, glabrous, (26)30–46-seeded; septa 5–6 mm apart; sutures slightly thickened, 1 mm wide.
Seeds greenish, olive-brown or orangish-brown, 2.5–3.5 × l.5–2 mm, 1–1.75 mm thick, subovoid to oblong, the hilum subcentral in a small circular pit surrounded by a rim aril.
Ovary sometimes speckled reddish-purple, strongly to sparsely pubescent to glabrescent along the upper margin; style glabrous to pubescent.
Calyx 7–8 × 8 mm, the tube sparsely pubescent or occasionally glabrous; teeth 0.5–1 mm long, subulate, sparsely pubescent.
Young stems densely and softly grey pubescent, not aculeate; older ones glabrescent and striate.
An erect, softly woody shrub to small tree 3–6 m tall, the trunk up to 12 cm in diameter.
