Woody, vine-like shrub, scandent or decumbent, large or small, the branchlets subterete, glabrous or subglabrous, copiously armed with recurved thorns. Leaves reportedly sensitive, moderate, bipinnate, the pinnae a single pair, the leaflets only 2 pairs per pinna; petiole up to 5 or 6 cm. long, subglabrous, eglandular, armed with recurved thorns, conspicuously pulvinate basally, apiculate terminally; pin-nular axis 1-2 cm. long, appendaged above the pulvinus, scarcely if at all aculeate; leaflets asymmetrically ovate-lanceolate, mostly 3-4 cm. long and 10-15 mm. wide, the inner member of the lower pair very reduced, acute-subacuminate apical-ly, obliquely rounded basally, glabrous and darker above, sparingly setose-strigose or subglabrous and lighter below, setose-ciliate on the margins; stipules ovate, about 3 mm. long, ciliate. Inflorescence of axillary, pedunculate heads, often few-fasciculate; peduncles mostly 1-2 cm. long, unarmed, subglabrous; heads ovoid, compact, multiflorate; floral bractlets linear-lanceolate or linear-oblanceolate, setose-fimbriate, about 2 mm. long. Flowers small, sessile, reportedly pinkish; calyx exceedingly minute, fimbriate-lobed; corolla funnelform, about 2 mm. long, subglabrous, the 4 lobes less than Y2 the length of the tube; stamens 4, 7-8 mm. long, the anthers orbicular; ovary setose. Legume oblong, 1-3 cm. long and 8-10 mm. wide, flat, segmented, densely setose-spinose on the persistent margins but little if at all so on the segments, otherwise glabrous.
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