Rhizomes yellow. Stems sometimes pale purple, erect. Petiole 1.2-3(-5) cm; leaf blade elliptic to ovate, 6-18(-21) × 3-7.5(-12) cm, papery, glabrous, base cuneate or slightly decurrent, margin entire, sinuate, or irregularly dentate, apex acute or acuminate. Pedicel stout, 1.5-4 cm. Calyx campanulate, 2-3 × 1.5-2.5 cm, short lobed, becoming 1-or 2-parted and irregular during corolla egress. Corolla pale yellow-green, ca. 4.5 cm; lobes purple striate abaxially, indistinct, short mucronate. Anthers 6-7 mm. Disc pale yellow. Fruiting pedicel ca. 4 cm. Fruiting calyx ca. 3 cm, leathery. Fruit subglobose, ca. 1.5 cm in diam. Fl. May-Jul, fr. Sep-Oct.
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