Dioecious woody climber. Leaves ternate or often imparipinnate with 5 leaflets; leaflets ovate, 1.2–4.5 cm long, 0.5–2.2 cm wide, entire or more rarely dentate, acute, usually glabrous. Flowers in axillary and terminal dichasial panicles. Tepals caducous, narrow-elliptic to narrow-ovate, 1.3–2.7 cm long, white, ± glabrous below except for lanuginose margin, glabrous above. Stamens 4–12 mm long; filaments glabrous; anthers narrowly ovate to broadly elliptic, 1.5–3 mm long, with linear appendage, 0.5–1 mm long; staminodes present. Achenes compressed, ovate, 4–5 mm long, 1.5–2 mm wide, usually glabrous, smooth; margin slightly pronounced; awn 2.0–4.5 cm long.