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A herb or small shrub. It has a woody taproot and grows 1.7-2.6 m tall. The leaves have 3 leaflets. The leaflets are 2.5-8.5 cm long by 0.8-2.5 cm wide. The flowers are yellow and turn reddish. The pod is 1.5-2 cm long by 0.7-0.9 cm wide. The seeds are orange and 2.5-4 mm long.
Leaves 3-foliolate; leaflets variable, 2.5–8.5 × 0.8–2.5 cm, linear-oblanceolate to lanceolate, oblong-elliptic or obovate, appressed pubescent at least beneath; petioles mostly 3.5–6.5 cm long; stipules 9–25 × 3–7 mm, oblong-falcate, acuminate, very unequal-sided.
Standard ovate, yellow, veined or suffused with orange, brown or purple, glabrous outside; wings a little shorter than the keel; keel 8.5–10(11.5) mm long, angled in the lower half, with a straight beak, lanate towards the upper edge.
Annual or short-lived perennial of rather varied habit, 0.3–2.6 m tall; branches densely pubescent with appressed to slightly spreading hairs.
Seeds c. 4 mm long, oblong-reniform, with a small aril, minutely granulate, sometimes radially veined, yellow, usually tinged orange or red.
Racemes 4–24 cm long, with many flowers crowded at least towards the top; bracts 3–4 mm long, subulate or filiform, early caducous.
Stems herbaceous, woody below, or an undershrub to 5 ft. high, with a woody taproot
Pod (1.2)1.5–2 × 0.7–0.9 cm, subsessile, oblong-ellipsoid, pubescent, 12–16-seeded.
Calyx 4–5 mm long, pubescent; lobes subulate-triangular, ± as long as the tube.
Flowers yellow, turning reddish
