Astragalus zacatecanus (Rydb.) Barneby

Phaca zacatecana Rydberg, sp. nov
Annual or short-lived perennial; stem about 3 dm. high, branched near the base, decumbent at the base, strigose-canescent when young; leaves ascending, 4-6 cm. long; stipules deltoid, 3-4 mm. long; leaflets 1 1-17, obovate or elliptic, 8-12 mm. long, glabrous above, villous-pilose beneath, rounded at the apex; peduncles 2-3 cm. long; racemes about 2 cm. long, 3-5-flowered; bracts lanceolate, 1 mm. long; calyx pilose, the tube 2.5 mm. long, the teeth subulate, 2 mm. long; corolla yellow, 6 mm. long; banner broadly obovate, strongly arched at the middle; wings almost as long, the blade obliquely obovate, with a laige basal auricle ; keel-petals shorter, the blade broadly lunate, acutish; pod ellipsoid, acute at each end, about 2.5 cm. long and 12 mm. wide, strigose.
Type collected at Casualidad, Zacatecas, April 26, 1892, M. E. Jones (herb. N. Y. Bot. Card.).

Atelophragma zacatecanum Rydb. Bull. Torrey Club 55: 157. 1928.
A perennial; stems rather stout, about 5 dm. high, sparingly short-pubescent with ascending hairs, terete; leaves ascending; stipules deltoid, acuminate, 5-6 mm. long; leaflets 9-15, oblong, 6-15 mm. long, 3-5 mm. wide, strigose beneath, glabrate above, rounded at the apex; peduncles 6-10 cm. long; racemes 5-15 cm. long; bracts subulate, 3 mm. long; calyx long-pilose, the tube 3 mm. long, the teeth fully 3 mm. long, attenuate; corolla cream-colored, 8-10 mm. long, similar to that of the preceding species, but usually smaller; pod glabrous, the stipe about 4 mm. long, the body oblong, acute at each end, 2-2.5 cm. long, 5 mm. wide, sulcate on the lower suture, the septum narrow, nearly 1 mm. broad; seeds 6-S.
Type locality: Zacatecas.
Distribution: Known only from the type locality.