Herbs. Rhizomes vertical, 2-3 mm in diam., internodes less than 1 cm. Leaves solitary; petiole streaked reddish brown, 10-20 cm, glabrous; leaf blade abaxially greenish, purple along principal veins, adaxially greenish with yellow-green blotches, triangular-ovate, 10-13 cm, both surfaces sparsely pubescent, base deeply cordate, lateral lobes rounded, 1-1.5 × 2-2.5 cm, apex acute; cataphylls broadly ovate, 0.8-1 × 0.6-0.8 cm. Peduncle ascending to erect, ca. 0.9 cm. Calyx dark purple, campanulate, 3-3.5 × 5-6 cm; sepals connate beyond attachment to ovary, abaxially glabrous; tube obconic, ca. 1.7 × 2 cm, strongly constricted at throat, adaxially tessellate, orifice ring 4-5 mm wide, broadly laminate; lobes broadly ovate, ca. 2.5 × 2 cm, base with papillate-corrugate area, undulate along margin. Stamens 12, oblong; filaments much shorter than anthers; connectives slightly extended beyond anthers, notched; staminodes 3, petaloid. Ovary superior. Styles free, apex hooked; stigmas lateral, linear-oblong. Fl. May.