Plants twining, 1-1.8 m, glabrous throughout. Roots carrot-shaped, ca. 18 × 1 cm, not branched. Stems purple, branched. Leaves on main stems and major branches alternate, larger; petiole 0.5-2 cm; blade lanceolate or ovate-lanceolate, 5-7 × 0.8-2.5 cm, thin, base rounded to cuneate, margin entire, apex shortly acuminate; those on branchlets similar but much smaller. Flowers solitary, terminal; pedicels 6-13 cm. Calyx tube adnate to ovary up to middle, semiglobose; lobes broadly linear, 22-30 × 5-8 mm, margin entire, apex obtuse or acute. Corolla yellow-green with purple reticulate markings, 50-55 × 25-28 mm. Fl. and fr. Aug-Sep.
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