Wiry vine; stems to 10 m long; young branches glabrous or puberulent. Leaves: petiole 0.4–2.8 cm long; lamina narrowly oblong-ovate to oblong-triangular, 3.5–16.5 cm long, 0.9–5.5 cm wide, glabrous on both surfaces; base rounded to truncate or occasionally oblique; apex acuminate. Flowers solitary, leaf-opposed or on axillary shoots. Calyx creamy white or greenish white, spotted and veined purplish, puberulent outside; utricle 7–12 mm long; tube 20–30 mm long; lobes spreading, broadly triangular, asymmetrical, one broader than remaining pair, 2.5–6 mm long, yellow with mottled maroon inside; apex mucronate or acute. Fruit obloid, 2–2.5 cm long, 1–1.4 cm diam. Seed triangular, 4–5 mm long, 3–4 mm diam., 1–1.5 mm thick, convex on both sides; surface minutely textured.
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