Leaves with 2(3) pairs of pinnae; one or more of the pinnae, usually terminal, modified to a tendril, or spirally twisted at the base and bearing leaflets above; leaves of scrambling shoots sometimes with the terminal pair of pinnae without leaflets and tendril-like, and the lower pair much reduced; leaflets 4-5(8) pairs, 1-3 x 0·5-1·5 cm., obovate-or oblanceolate-oblong or sometimes narrowly oblong, rounded to subtruncate and mucronate or not at the apex, asymmetric at the base, glabrous, lateral nerves and venation distinctly raised and easily visible at least beneath and often on both surfaces.
Racemes solitary in axils but often aggregated, (2)3·5-6 cm. long (not including the usually 1-2 cm. long peduncle), glabrous; pedicels 1-1·5 mm. long.
Slender woody climber, unarmed, said to have a tuberous root; young branchlets glabrous, often flexuous.
Pods c. 12-24 x 2·7-4·3 cm., subcoriaceous, falcately curved, with a stipe 1·5-2·5 cm. long.
Stamen-filaments c. 3 mm. long.
Flowers purple or brownish-red.
Calyx 1 mm. long, glabrous.
Petals 2·5 mm. long.
Seeds c. 10 x 9 mm.