Senegalia potosina Britton & Rose

Senegalia potosina Britton & Rose, sp. nov
A vine with quadrangular stems 1-2 inches thick, climbing into the tops of trees, the twigs puberulent and prickly. Petiole prickly, bearing a small stalked gland near the top; rachis prickly, bearing several stalked glands between the upper piimae; pinnae 10-15 pairs; leaflets 20-30 pairs, linear, 5-6 mm. long, reticulate-veined beneath, glabrous except a few hairs on the midvein beneath, the midvein subcentral; inflorescence paniculate; flowers capitate; calyx and corolla puberulent; legmne oblong, 12 cm, long, 18-25 mm. broad, stipitate, velvetypubescent.
Lowland forests near Las Palmas, San Luis Potosi, July 24, 1891, C. G. Pringle 3782.