Perennial or annual bushy herb, up to 80 cm. tall; hairs on stem usually spreading and yellowish, ± 0.5 mm. long.. Leaves 1-foliolate; stipules narrowly triangular, up to 6 mm. long; petiole up to 5 mm.; petiolule 1–2 mm. long; leaflet elliptic-oblong to lanceolate, apex rounded or acute, up to 7 cm. long and 2.5 cm. wide, white pilose above and beneath; chief lateral nerves 5–6 on each side, very prominent and rufous pilose beneath.. Flowers orange or brick red, in short dense terminal pseudoracemes, usually of but 1–3 nodes, often also in uppermost leaf-axil; bracts narrowly triangular, persistent, ± 7 mm. long; pedicels up to 3 mm. long.. Calyx hirsute with both brown and white hairs; tube ± 2 mm. long; lobes lanceolate-acuminate, with long attenuate tips, lowest ± 6 mm., lateral ± 5 mm., upper, united for ± 1 mm., ± 4.5 mm. long.. Standard tomentose outside, ± 9 mm. long; keel glabrous.. Upper filament lightly attached, widened, but not callous, 1 mm. above the base; filament-sheath ± 8 mm., free parts 3–4 mm., anthers 0.7 mm. long.. Style glabrous, curved into a semicircle, penicillate, ± 6 mm. long.. Pod somewhat upcurved, apical angle 60°–70°, up to 5 cm. long, ± 5 mm. wide, brown hirsute, 10–11-seeded.. Seeds oval, transverse; hilum near the narrower end; aril well developed.
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