Astragalus tolucanus B. L. Rob. & Seaton

Atelophragma tolucanum (Rob. & Seaton) Rydb. Bull
Torrey Club 55: 156. 1928.
Astragalus toliicanns Rob. & Seaton, Proc. Am. Acad. 28: 104. 1893.
A perennial, with a thick woody root; stems 1-2 dm. long, branched, ascending, strigose, slender; leaves 4-6 cm. long, spreading, short-petioled, the rachis sulcate, nearly glabrous; stipules hyaline, ovate or deltoid, 5-7 mm. long ; leaflets 1 7-25, elliptic to obovate, 4-7 mm. long, 2-3 mm. wide, cuneate at the base, rounded, truncate, or retuse at the apex; peduncles 3-5 cm. long; racemes many-flowered, 3-5 cm. long; bracts oblanceolate, 5-6 mm. long, hyaline, pubescent ; calyx black-hairy, the tube 3 mm. long, 2.5 mm. broad, the teeth narrowly lanceolate, 3.5 mm. long; corolla variegated with bluish-purple and yellow; banner about 12 mm. long, broadly obovate, moderately arched, striped with bluish-purple and yellow; wings 10 mm. long, the blade purple, oblanceolate, arcuate, with a large reflexed auricle, the claw yellow; keelpetals 7-8 mm. long, the blade broadly lunate, nearly semiorbicular, reddish-purple and rounded at the apex; pod glabrous, the stipe 2-3 mm. long, the body ellipsoid, acutish at each end, 12-15 mm. long, 6 mm. broad.
Type locality: Nevado de Toluca, State of Mexico. Distribution: Known only from the type locality.