Desmanthus pumilus (Schltdl.) J. F. Macbr.

Acuan pumilum (Schl.) Britton & Rose
Mimosa />Hmi7a .Schl. Linnaea 12: 557. 1838.
Desmatithus hnurvus Benth. Lond. Journ. Bot. 5: 84. 1846.
Acuan iynnrvum Kuntze, Rev. Gen. PI. 158. 1891.
Desmanthus pumilus Macbride, Contr. Gray Herb. 59: 14. 1919.
Stems glabrous, or sparingly pubescent above, diffuse, 3-4 dm. long. Stipules filiform, 3-4 mm. long; leaves 4-6 cm. long; petioles and rachis slender, glabrous or nearly so ; gland small or wanting; petiole 6-12 mm. long; pinnae 5-10 pairs; leaflets 10-18 pairs, linear-oblong, 3-4 mm. long, acutish, ciliate at least when young, the midvein slightly excentric, the lateral venation obscure; peduncles glabrous, 2-4 cm. long in fruit; heads few-flowered; stamens 10, 6-8 mm. long; legume flat, falcate, 2-3 cm. long; about 5 mm. wide, reticulate-veined, glabrous.
Type locality; Near Regla, Mexico. Distribution: Mexico; Hidalgo; Zacatecas.