Herbs robust, with fleshy roots. Rhizomes vertical, 3-4 mm in diam., internodes less than 1 cm. Leaves solitary; petiole 15-25 cm, glabrous; leaf blade adaxially deep green, rarely blotched, narrowly or broadly ovate to triangular-ovate, 15-25 × 11-14 cm, abaxial surface glabrescent, adaxial surface glabrous, base auriculate-ovate or auriculate, lateral lobes divaricate, 6-11 × 4-6 cm, apex acuminate; cataphylls ovate, ca. 1 × 0.5 cm. Peduncle ascending, 1.5-6 cm. Calyx purplish green, campanulate, 2.5-3 × 2.5-3 cm; sepals connate beyond attachment to ovary, abaxially glabrous; tube subcylindric, 1.5-2.5 × 0.7-1.2 cm, strongly constricted at throat, adaxially longitudinally ribbed, orifice ring ca. 2 mm wide; lobes ovate-reniform, 1-1.4 × 1.2-1.8 cm, base with papillate-corrugate area. Stamens 12; filaments much shorter than anthers; connectives slightly extended beyond anthers, awl-shaped. Ovary half-inferior. Styles free, apex 2-forked; stigmas lateral. Fl. Nov-Apr.
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