Astragalus tioides (Rydb.) Barneby

Atelophragma tioides Rydb. Bull. Torrey Club 55; 157. 1928.
A cespitose perennial; stems decumbent, much branched, 3-5 dm. high, slender, terete, strigose; leaves ascending, 5-7 cm. long; stipules deltoid, 3-4 mm. long; leaflets 13-21, obovate, usually retuse at the apex, 5-10 mm. long, 4-7 mm. wide, pilose beneath, glabrate above ; peduncles 41 cm. long ; racemes 3-5 cm. long, rather few-flowered ; bracts subulate, 3 mm. long ; calyx minutely black-hairy, the tube 3 mm. long, the teeth subulate, 2 mm. long; corolla cream-colored, about 1 cm. long; banner obovate, moderately arched; wings shorter, the blade oblong, slightly falcate; pod glabrous, the stipe very short, shorter than the calyx-tube, the body linear, about 3 cm. long, 5 mm. wide, acute at each end, rather deeply sulcate on the lower suture, the septum narrow; seeds 16-18, dark-brown, 3 mm. long.
Type locality: Valley of San Luis Potosi. Distribution: San Luis Potosi.