Plant: Perennial (sometimes flowering first year or annual), moderately leafy, ± glabrous to silvery-strigose Leaves: compound, alternate, stipuled, 1-15 cm, odd-1-pinnate; leaflets linear to widely ± ovate; stipules membranous, sometimes fused around stem at stem base INFLORESCENCE: raceme, axillary; flowers 3-± 50, ascending or spreading Flowers: bilateral; calyx 5-lobed; petals purplish, cream, whitish, or mixed purplish and whitish, keel 0.65-0.8 X banner, banner outside wings in bud, recurved 30-50 degrees; 9 filaments fused, 1 free; ovary (and fruit) generally sessile, style slender, stigma minute Fruit: legume, ovoid or spheric, widely grooved above and below, generally ± bladdery, ± papery, deciduous; beak generally triangular, flat; chambers 2 below beak; Seeds 2-many, smooth, compressed, ± notched at attachment scar Misc: Generally dry, open places; -30-3600 m. Notes: Inflorescence 5-35 flowered. References: Kearney & Peebles; Arizona Flora. ASU specimans.