Mimosa sinaloensis Britton & Rose

Mimosa sinaloensis Britton & Rose, sp. nov
A clambering woody vine, 5-7 m. long or longer, the branches slender, somewhat angled, glabrous, densely armed with short reflexed prickles. Petiole and rachis prickly; pinnae 2-6 pairs, slender; leaflets 5-12 pairs, ovate-oblong, somewhat oblique, acute, glabrous, 4—7 mm. long, 1.5-2 mm. widfe; inflorescence axillary or racemose; peduncles 1.5-2.5 cm. long, glabrous, prickly; heads globose; calyx and corolla glabrous; stamens twice the number of the corollalobes; ovary pubescent; legume 6-8 cm. long, 8-10 mm. wide, somewhat shining, puberulent, unarmed, apiculate, several-jointed.
Sinaloa. Type from thickets near Mazatlan, April 1, 1910, Rose, Slandley & Russell 13830.