Plant: Annual, hairy; stem decumbent or ascending, 1-4 dm Leaves: stipules generally entire, sometimes dentate; leaflets 4-12 mm, elliptic or obovate, generally notched at tip INFLORESCENCE: raceme, 3-6-flowered Flowers: calyx 2-2.5 mm; corolla 3-5 mm, yellow, 9 filaments fused, 1 free Fruit: legume, indehiscent, coiled 3-4 turns, spheric to short-cylindric; prickles hooked; Seeds few, often ± reniform, generally hard, smooth Misc: Disturbed and waste areas; < 1000 m. Notes: pods spirally coiled, pubescent between prickles on the fruit, this plant is rare. References: Kearney & Peebles; Arizona Flora. McDougall; Seed plants of Northern Arizona. Hickman ed.; The Jepson Manual. ASU specimans.