Indigofera montana Rose

Indigofera montana Rose, Contr. U. S. Nat. Herb 8: 311. 1905.
Shrubby at the base; stem 5-12 dm. high, angled, strigose; stipules subulate-setaceous, 2 mm. long; leaves spreading, S-12 cm. long; rachis and petiole densely strigose; leaflets 1531, oblong, obtuse or retuse and mucronate at the apex, acutish at the base, 1-2.5 cm. long, 5-10 mm. wide, strigose on both sides; racemes nearly equaling the leaves, at least in fruit, rather densely many -flowered; calyx scarcely more than 1 mm. long, darkly ferruginous; corolla 5 mm. long, densely and darkly ferruginous strigose without; pod oblong, slightly curved, abruptly acute, 6-9 mm. long, 2.5 mm. broad, 2or 3-seeded, terete; seeds 2 mm. thick.
Type locality: Between Mesquitec and Monte Escobado, Jalisco.
Distribution: Durango to Jalisco and Zacatecas.