Description
Key Characters:
Growth Form:
short-lived subshrubs up to 1.5 m tall.
Stems:
Roots:
Leaves:
Leaves compound.
Alternate.
Leaflets 7–15(–21), oblanceolate, elliptic–oblong, or obovate, (5–)10–32 mm long, (2–)5–11 mm wide.
Lower surfaces inconspicuously strigillose.
Leaflet margins entire.
Lateral veins paired, parallel, forming a sharp angle with the midrib, extending to the margin.
Petiolate.
Stipules present.
Flowers:
Flowers in clusters on a short, upcurved just before reflexion of the standard, in inflorescences up to 25 cm long, thick axis, bracts present.
Flowers papilionaceous; bracteoles absent.
Calyx 5-lobed, strigillose to sericeous, teeth deltate, the lowest one 2.5–3 mm long, the others 2–2.5 mm long.
Corolla pale pink, purple, or sometimes nearly white, standard 6–10 mm long, standard suborbicular, without basal auricles.
Stamens 10; upper stamen distinct at base, the other 9 connate into a tube.
Ovary superior, sessile.
Fruit:
Pods linear; 20–45 mm long; 3–5 mm wide; strigillose; beaked; curved slightly upward toward tip; twisting when dehisced.
Seeds 2–9; pale brown to black; rectangular to transversely elliptic; 2.5–5 mm long; 1.8–3 mm wide.
Ploidy:
2n = 16; 22; 24; 44
Habitat:
Primarily on dry; rocky; or clay soil in coastal sites; on open lava fields; dry slopes; and ridges; and in pastures.
Elevation Range:
5–610 m.