Plant: Annual, generally slender, ± minutely grayish strigose; stem prostrate to ± erect, 3-30 cm Leaves: generally compound, alternate, stipuled, 0.8-7.5 cm, odd-1-pinnate; leaflets 9-17, 2-14 mm, linear to oblanceolate, tips notched; stipules membranous, sometimes fused around stem at stem base INFLORESCENCE: raceme, axillary, head-like; flowers 5-30, < 9 mm, erect or ascending Flowers: bilateral; calyx 5-lobed, calyx hairs ± mixed black, white; petals whitish, purple-tinged; banner outside wings in bud, keel blades with small protrusion at base locking into pit on adjacent wing; 9 filaments fused, 1 free; ovary (and fruit) generally sessile, style slender, stigma minute Fruit: legume, ascending, ± included in calyx, 2-4 mm, ± 2 mm wide, ± spheric, 2-lobed in X -section, ± minutely strigose, rarely glabrous, coarsely wrinkled, drying stiffly papery; chambers 2; Seeds 2-many, smooth, compressed, ± notched at attachment scar Misc: Open grassy, gravelly, or sandy areas; 0-1550 m.