Herbs perennial, with fusiform tubers; axial parts densely pubescent. Stems twining, striate. Petiole 0.4-2 cm; leaf blade rhombic, rhombic-ovate, or nearly circular, 3-10.5 X 1.5-10 cm, densely dull yellow sericeous, glabrescent, base cuneate, margin entire, apex abruptly acuminate or acute, rarely obtuse and mucronulate. Inflorescences 1-to many flowered; peduncle 2-12.5 cm; bracts scalelike, 2-3 mm, pubescent. Pedicel 7-10 mm, thicker than peduncle, glabrous. Sepals unequal; outer 2 obovate-oblong, 0.8-1.2 cm, abaxially pubescent, mucronulate; inner ones obovate or elliptic, 1.3-1.4 cm, apex obtuse. Corolla lilac or pink to white, narrowly campanulate, 3.5-4 cm; limb shortly 5-lobed; lobes dull yellow ciliate, mucronulate. Stamens unequal; filaments dilated basally, pubescent. Ovary glabrous. Capsule oblong, 7-9 mm. Seeds black, ca. 5 mm, glabrous.
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