Herbs. Rhizomes vertical, 2-3 mm in diam., internodes less than 5 mm. Leaves solitary; petiole 6-16 cm, glabrescent; leaf blade adaxially with or without white blotches, triangular-ovate or nearly triangular to elliptic-ovate, 6-13 × 5-12 cm, abaxial surface glabrous, adaxial surface pubescent along midvein or over entire surface, base cordate-auriculate, apex acute or shortly acuminate; cataphylls ovate, ca. 1.5 × 0.7 cm. Peduncle recurved, ca. 1.5 cm. Calyx purplish green, urceolate-rotate, 3-5 × 4-5 cm; sepals connate beyond attachment to ovary, abaxially glabrous; tube cylindric, 1-5 × 0.8-1.5 cm, not constricted at throat, adaxially longitudinally ribbed with rows of papillae, orifice ring inconspicuous; lobes triangular-ovate, ca. 3 × 2.5-3 cm, base with triangular papillate area. Stamens 12; filaments much shorter than anthers; connectives slightly extended beyond anthers, acute. Ovary inferior. Styles free, apex 2-forked; stigmas lateral. Fl. Apr-May.
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