Woody climbers, large, sometimes erect shrubs or small trees. Stems subsarmentose; branches numerous, spreading, some occasionally reduced to spiral-hooked. Leaves 20-30 cm; rachis puberulent; stipules caducous; leaflets (13-)15-19; petiolules ca. 5 mm, pubescent; blades oblong, elliptic-oblong, or ovate, 2.5-5(-7.5) × 1-2(-3.3) cm, subleathery or membranous, both surfaces finely appressed pubescent, more densely so on midvein abaxially, both ends rounded, occasionally apex obtuse, emarginate. Panicles terminal, often extending into axils of upper leaves, compact, cymose; peduncles and branches puberulent. Flowers shortly pedicellate; bracteoles deciduous, ovate, membranous. Calyx campanulate, outside sparsely pubescent, 5-toothed; teeth with ciliate margins, lowest oblong, apex rounded, longer than others, others subequal and ca. as long as tube, upper 2 subconnate. Corolla white; standard broadly obovate-oblong, emarginate, cuneate base attenuate to short, broad claw; wings obovate-oblong; keel half-moon-shaped, shortly auriculate on upper side below, long, narrowly clawed as wings. Stamens 9, monadelphous; filaments free on upper side, alternately shorter and longer. Ovary long stipitate, glabrous or puberulent along suture, 2-or 3-ovuled; style short; stigma capitate. Legume oblong or elliptic, 3.5-6.5 × 2-2.5 cm, leathery, glabrous, distinctly reticulate opposite 1 seed or occasionally 2 or 3 seeds. Seeds orbicular-reniform, compressed, ca. 12 × 7 mm. Fl. Apr-Jun, fr. Aug-Oct.
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