Suffruticose perennial, up to 90 cm tall. Branches glabrous to subglabrous. Stipules lateral, c. 1.5 mm long, acute. Leaf paripinnate, c. 4.5-11.5 cm long. Leaflets 5-9 pairs, petiolule c. 1 mm long, lamina c. 1.2-4 cm long, c 3.5-10 mm wide, glabrous to sparingly hairy on both sides, lanceolate to ovate, tip acute. Inflorescence termical or axillary raceme, up to 15 cm long. Young flowers covered with c. 7-8 mm long cup-shaped bracts. Pedicel 3-4 cm long. Sepals 5, subequal, 10-13 mm long, c. 6-8 mm broad, spoon shaped or cup shaped, light yellow in colour. Petals 5, subequal, 14-17 mm long, 7-10 mm wide, obovate, shortly claw¬ed, deep yellow, veins becoming prominent after drying. Stamens 10, upper 3 reduced to staminodes, rest perfect, 2 lower largest. Ovary densely hairy, stipitate. Fruit c. 4-5 cm long, c. 16-22 mm broad, sparsely hairy, turning black at maturity, generally 4-10 seeded; stipe 2-3 mm.
Finely strigose frutescent herb of glabrate aspect. Leafstalk 5-15 cm, eglandular; leaflets 4-7(-10) pairs, barely petioluled, lanceolate, 2-3.5(-5) cm long, 2-4.2 r, usually acute to rounded, mucronate or not. Stipules subulate, inconspicuous. Flowers in axillary racemes elongating in fruit to 2 dm. Pedicels 3-5 mm; sepals subequal, ca 6 mm; corolla yellow, 1.5-3 cm diam; functional stamens 7, 2 larger than others. Legume dehiscent, stipitate, asymmetrically elliptic-oblong, slightly falcate, flat, 3.5-5 cm long, 1.5-2.3 cm wide; valves papery-membranous, transversely septate within; stylar beak or scar ventrally displaced. Seeds few-many.
An undershrub with pale more or less zigzag branchlets
Erect racemes of yellow flowers
Young stems with appressed puberulence or short spreading pubescence, eglandular.
Leaves (3–)5–15 cm. long; petiole and rhachis eglandular. Stipules subulate, linear or narrowly triangular, 3–5 mm. long, up to 1 mm. wide. Leaflets in (3–)4–8(–12) pairs, lanceolate to narrowly elliptic or elliptic, 1.5–5.2(–6) cm. long, 0.4–0.9(–1.5) cm. wide, narrowly acute to rounded at apex, with or without a slender mucro up to 1 mm. long, appressed-puberulous or pubescent.
Racemes (including peduncle) 5–30 cm. long.
Shrub 0.3–3 m. high.
Bracts subtending flower-buds 0.5–1.1 cm. long, 0.35–0.5 cm. wide.
Seeds ± compressed, in same plane as pod, oblong, apiculate near hilum, 6–7 mm. long, 4 mm. wide, 2 mm. thick, reticulate or rugose, with a small areole 1–2 × 0.5–0.7 mm. on each face.
Pods (3–)4–7 cm. long, 1.6–2.6 cm. wide, shortly oblong, flattened, slightly and upwardly falcate or sometimes almost straight, dehiscent, transversely septate, not winged or crested, papery.
Stamens 10; filaments straight or nearly so; 2 anthers large, 5 medium, 3 small.
Petals yellow or orange-yellow, 0.7–1.7 cm. long, 0.7–0.9 cm. wide.
Se United States and California. Experimental novelty. N Africa to India, widely cult, in India, established in tropics of both hemispheres.