Astragalus triflorus (DC.) A. Gray

Phaca candolleana H.B.K. Nov. Gen. & Sp. 6: 495. 1824
Astragalus triflorus A. Grav, PI. Wright. 2: 45, in part. 1853. Not Phaca triflora DC. 1802. Astragalus Candolleanus Sheldon, Minn. Bot. Stud. 1: 140. 1894. Not .4 . Candolleanus Royle, 1835. Astragalus triflorus Candolleanus M. E. Jones, Proc. Calif. Acad. II. 5: 637. 1895.
Perennial, with a cespitose caudex; stem pubescent, erect or decumbent below, angled; leaves ascending, 5-10 cm. long; stipules lanceolate-deltoid, acuminate, pubescent, 3-4 mm. long, deciduous; leaflets 17-25, linear-oblong, obtuse or emarginate, sparingly hirsute, 7-10 mm. long, 2-3 mm. wide; peduncles 2-5 cm. long; racemes 41 0-flowered ; calyx pubescent, the tube campanulate, 2-2.5 mm. long, the lobes subulate, 1-1.5 mm. long, acuminate; cotolla white, about 7 mm. long; banner obovate, retuse, strongly reflexed; blade of the wings oblong, with an acute basal auricle, longer than the claw; keel-petals shorter, the blade obliquely obovate, obtuse, with a rounded basal auricle; pod ellipsoid, sessile, glabrous, straw-colored, 14-18 mm. long; seeds obliquely reniform.
Type locality: Vulcano Jorullo, Mexico. Distribution: Southern Mexico.