Erect to procumbent small tree or shrub, the branchlets glabrous or sparsely puberulent, inconspicuously lenticellate, often longitudinally striate or ridged, usually sparsely armed with rather small, scattered, recurved thorns. Leaves large, bipinnate, the pinnae 6-11 pairs, more or less opposite, the leaflets many (frequent-ly 25 or more) pairs per pinna; petiole 1-4 cm. long, subterete, sulcate above, glabrous or pubescent, bearing a shallow, oblong, cupulate gland usually near the middle; rachis up to 25 cm. long, usually puberulent above, eglandular except sometimes bearing a cupulate gland at insertion of terminal pair of pinnae; pin-nular rachis up to 8 cm. long, usually bearing a small gland at insertions of distal 1-2 pairs of leaflets, pubescent, subalate; leaflets linear, 4-8 mm. long and 1-2 mm. wide, broadly acute apically, asymmetrically rounded or truncate basally, glabrous, the costa excentric baseward, the secondary venation remote, ascending; stipules linear-setiform, as much as 6 mm. long. Inflorescence of elongate, pedunc-ulate, axillary spikes, these solitary or few-fasciculate, near the tips of twigs arising from nodes not yet foliate and hence appearing somewhat paniculate; peduncles usually less than 1 cm. long, subtomentose; spike commonly about 6-7 cm. long, the axis pubescent, the flowers moderately dense, the floral bracts minute. Flowers sessile, reported yellow; calyx cupulate, about 1 mm. long, 5-lobed, glabrous; corolla of 5, free, nearly linear petals about 3 mm. long, glabrous; stamens nor-mally 10, free, inserted atop a short tube or androgynophore, 5-6 mm. long; anthers broadly oblong, almost 1 mm. long, bearing an apical gland, glabrous; ovary glabrous, conspicuously stipitate, apparently abortive in some flowers; stigma narrow. Legume broadly linear, 5-9 cm. long and about 15 mm. wide, thin, glabrous, glandular when young, the surface irregular because of maturing seeds but not constricted between the seeds.
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