Dioecious woody climber to 3 m high. Leaves ternate (simple when juvenile or first pair on branches); leaflets ovate to elliptic-lanceolate, 2.5–8 cm long, 1–4.5 cm wide, entire or rarely with few teeth or triangular lobe near base, acute, glabrous. Flowers in axillary and terminal dichasial panicles. Tepals narrow-oblong, 11–25 mm long, pubescent below, glabrous above, white. Stamens 5–10 mm long; filaments glabrous; anthers linear to narrowly elliptic, mostly 1.5–2 mm long, with obtuse appendage, 0.2–0.5 mm long; staminodes present. Achenes compressed, ellipsoidal, 4–8 mm long, 2–3 mm wide, reddish brown, sparsely pubescent to glabrous, smooth; margin only slightly thickened; awn 3.7–4.7 cm long.
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