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Shrubs, scandent, with large, fleshy tuber underground. Stems terete, glabrous. Pinnae 2 pairs, 4.5-7.5 cm; leaflets 8-11 pairs per pinna, obliquely oblong, 1.1-1.9 cm × 4-8 mm, base half cuneate, half rounded, apex rounded to mucronulate or slightly emarginate. Spikes supra-axillary, ca. 15 cm. Flowers bisexual or male. Calyx cup-shaped, to 1 mm. Petals oblong-linear, ca. 3 mm, apex mucronate. Stamens 5.5-7 mm. Ovary ca. 1.5 mm, glabrous. Legume dark brown, oblong, ca. 30 × 5 cm; segments 2.3-3 cm, epicarp rigidly papery, endocarp thinly parchmentlike. Seeds dark brown, irregularly ovoid, ca. 1.8 × 1.6 cm. Fl. and fr. Aug-Nov.
A climbing vine. The branches are slender, round and smooth. The leaves have two rows of leaflets and are slightly covered with soft downy hairs when young. The leaflets are oblong, papery and about 8 pairs with the edges rolled lengthwise. The leaf stalks are short. The pods are narrowly oblong, flattened and 10 to 25 cm long. They are 4 to 5 cm wide. The seeds are shiny, round, flattened and about 2 cm across.
