Astragalus nuttallianus var. macilentus (Small) Barneby

Hamosa macilenta Small, Fl. SE. U.S. 618, 1332. 1903
A slender annual; stem sparingly strigose, often branched at the base, 1-2 dm. high; leaves ascending, 5-7 cm. long; stipules lanceolate, 3-4 mm. long; leaflets 11-19, linear or oblong, acute or obtuse, 4-12 mm. long, 1-3.5 mm. wide, sparingly pilose-strigose on both sides or glabrate above; peduncles 3-7 cm. long; racemes 2-3 mm. long; bracts lance-subulate, 2 mm. long; calyx strigose, the tube about 2 mm. long, the teeth subulate, 2 mm. long", corolla about 1 cm. long; banner purplish, obovate, retuse at the apex; wings apparently white or yellowish, the blade broadly oblanceolate, obtuse; keel-petals purple-tipped, the blade broadly lunate, rounded at the apex; pod glabrous, decidedly arcuate at the base, 2.5 cm. long, 2 mm. wide and thick, sulcate on the lower suture.
Type locality: Rio Blanco, Texas. Distribution: Texas.