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Stems twining, to several m long. Leaves ovate to triangular, cordate, hastate to truncate at base, acute to acuminate; lamina 4–16 cm long, 2–9 cm wide, 7–9-veined, thin to coriaceous; petiole 3–5 cm long. Flowers in 1–5-flowered cymes to 13 cm long, cymes often umbel-like, rarely with rachis elongate; peduncle 1–10 cm long; pedicels 6–22 cm long. Perianth segments narrowly ovate, acute to shortly acuminate, 10–15 mm long, dark purplish red. Stamens 10–12 mm long; anthers 2–5 mm long, with appendages 2.5–3.5 mm long. Capsule acute to acuminate, 14–16 mm long. Seeds 6–8, 5–6 mm long; appendages c. 3 mm long.
