Tephrosia watsoniana (Standl.) J. F. Macbr.

Cracca watsoniana Standley, Contr. U. S. Nat. Herb 23: 472. 1922.
Clitovia (?) sericea S. Wats. Proc. Am. Acad. 22: 407. 1887.
Cracca sericea Rose, Contr. U. S. Nat. Herb. 12: 271. 1909. Not C. sericea A. Gray, 1883; nor C. sericea Kuntze, 1891.
A perennial, somewhat suffruticose at the base; stems 1-3 dm. high, densely silky, with ascending or appressed hairs; leaves unifoliolate, or on vigorous plants 3-7-foliolate, with the terminal leaflet larger than the rest; stipules linear-subulate, 5-10 mm. long; petiole 0.5-3 cm. long; leaflets linear-oblong to oblanceolate or oval, 2-8 cm. long, 1-3 cm. wide, green and somewhat silky above, densely white-silky and with prominent veins beneath, obtuse or rounded and mucronate at the apex, obtuse or rounded at the base; racemes terminal, 5-18 cm. long; flowers 1-3 at each node; bracts subulate; calyx white-silky, the tube 3 mm. long, the lobes deltoid, lanceolate, long-acuminate, 4—5 mm. long; banner broadly obovate, villous on the back; wings broadly oblanceolate; pod 4-5 cm. long, about 5 mm. wide, densely short-silky with at first appressed, later spreading hairs, 6-8-seeded;
Type locality: Rio Blanco, Jalisco.
Distribution: Tepic and Jalisco to Guerrero.