Herbs slender, with fibrous roots. Rhizomes horizontal, 2-3 mm in diam., internodes 6-12 cm. Leaves solitary; petiole 7-18 cm, glabrous; leaf blade uniformly colored, oblong-ovate or narrowly elliptic-ovate, 8-14 × 5-8 cm, abaxial surface glabrous, adaxial surface sparsely pubescent, more densely so along veins and margin, base auriculate or nearly hastate, lateral lobes nearly triangular, 3-3.5 × 2-2.5 cm, apex acuminate; cataphylls narrowly ovate, 1-1.5 × 0.5-0.7 cm. Flowers solitary. Peduncle ascending, ca. 1.5 cm. Calyx purplish green, urceolate-campanulate, 2-3 × 2-3 cm; sepals connate beyond attachment to ovary, abaxially glabrous; tube cylindric, ca. 1.5 × 1 cm, strongly constricted at throat, adaxially longitudinally corrugate, orifice ring ca. 2 mm wide; lobes broadly ovate, ca. 1.5 × 1.5 cm, base with papillate-corrugate area. Stamens 12; filaments much shorter than anthers; connectives slightly extended beyond anthers, ligulate. Ovary half-inferior. Styles free, apex 2-forked; stigmas lateral. Fl. Jul-Dec.
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