Plant: Annual forb, hairy, sometimes finely strigose; stem decumbent to ascending, generally 1-4 dm Leaves: leaves trifoliate, the leaflets dentate, generally 1-1.5 cm; stipules entire or toothed INFLORESCENCE: raceme, axillary, ovoid, 10-20-flowered, dense Flowers: flowers small; calyx 1-1.5 mm, lobes ± equal or not; corolla 2-3 mm, yellow; 9 filaments fused, 1 free Fruit: legume, indehiscent, 2-2.5 mm, reniform, black; veins strong, kidney-shaped, coiled in 1 plane, pubescent.; prickles 0; Seed 1,often ± reniform, generally hard, smooth Misc: Disturbed areas, sometimes in forests, mtns; < 2500 m.; Apr-Jul Notes: fruits coiled References: Kearney & Peebles; Arizona Flora. McDougall; Seed plants of Northern Arizona. ASU specimans.