Dioecious creeper or weak climber, to 2 m high. Leaves biternate or flammuliform; second pair of pinnae often with only 2 leaflets; leaflets 9–12 (–15), linear to linear-lanceolate, 25–60 mm long, 1.5–3.5 mm wide, sometimes deeply divided, or with 1 or 2 long lobes, entire, glabrous. Flowers in few-flowered dichasial panicles. Tepals linear to linear-lanceolate, 2–5.5 cm long, white, glabrescent below, tomentose at margin. Stamens 2–9 mm long; filaments glabrous, purplish violet; anthers broadly ellipsoidal to ± globular 0.5–1 mm long, without appendage; staminodes present, filaments purplish violet. Achenes compressed-ellipsoidal, 5.5–6.0 mm long, 1.5–1.7 mm wide, glabrous, margin slightly thickened; awn 10–12 cm long.
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