Desmanthus painteri (Britton & Rose) Standl.

Acuan arsenei Britton & Rose, sp. nov
Suffrutescent, diffuse or ascending, up to 6 dm. long, the slender stem and branches densely short-villous. Stipules filiform, about 3 mm. long; leaves 4—6 cm. long, the petiole and rachis short-villous ; petioles short ; pinnae 2-6 pairs, with a small orbicular gland between the lower pair; leaflets 12-20 pairs, linear, acute, long-ciliate, 2.5-4 mm. long, the venation obscure; peduncles slender, short-villous, 3-6 cm. long; heads small, several-flowered; legumes linear, nearly straight, 3-4 cm. long, 5 mm. wide, short-tipped.
Coahuila and Puebla. Type from Saltillo, Coahuila, 1909, Brother Arsene 3455.