Astragalus oxyrhynchus Hemsl.

Hesperastragalus oxyrhynchus (Hemsl.) Rydb. Bull. Torrey
Club 53: 165. 1926.
Astragalus oxyrhynchus Hemsl. Biol. Centr. Am. Bot. 1: 265. 1880. Tragacantha oxyrhyncha Kuntze, Rev. Gen. 947. 1891. Astragalus angelinus M. E. Jones, Rev. Astrag. 286. 1923.
A perennial, with several slender under-ground stems; stems decumbent, 1-2 dm. long, strigulose, often canescerft; leaves 3-6 cm. long, ascending, the rachis strigulose; stipules deltoid, strigose, 3 mm. long; leaflets 15-25, linear, retuse to obtuse at the apex, glabrous above, strigose beneath; peduncles 3-7 cm. long, erect; racemes dense, 2-4 cm. long, many-flowered; bracts lanceolate, 1 mm. long; pedicels reflexed, 2 mm. long; calyx strigose with mixed white and black hairs, the tube campanulate, 1 .5 mm. long, the teeth subulate, about as long ; corolla 5-6 mm. long; banner broadly obovate, abruptly arched, slightly retuse, purplish with dark veins; wings slightly shorter, the blade obliquely oblong, falcate; keel-petals nearly as long, the blade semi-orbicular, obtuse; pod strigose, cross-reticulate, coriaceous, 7 mm. long, 3 mm. wide, and 4 mm. thick, the lateral view semi-ovate, straight on the upper suture, the dorsi-ventral view ovate, the cross-section broadly cordate, but only slightly sulcate on the lower suture.
Type locality: Tizapan, Valley of Mexico (Federal District).
Distribution: Mexico and Hidalgo.