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Plant: Annual, generally glabrous; stem prostrate, mat-forming, or ascending, 1-4 dm Leaves: generally odd-1-pinnate, stipules generally cut 1/2 width or deeper; leaflets generally 1-2 cm, generally wedge-shaped or obovate, length 1-2 X width INFLORESCENCE: raceme, 2-6-flowered Flowers: calyx ± 3 mm; corolla 3.5-6 mm, yellow; 9 filaments fused, 1 free Fruit: legume, indehiscent, coiled 2-6 turns, ovoid to short-cylindric; prickles ± straight, hooked, or 0; Seeds few, generally hard, smooth Misc: Disturbed and agricultural areas; < 1500 m. Notes: spirally coiled, straw colored. References: Kearney & Peebles; Arizona Flora. ASU specimans