Herbs perennial, 10-50 cm tall. Rhizomes thick, scaly. Leaves all basal; petiole 1.5-13 cm, sheathing base glabrous at margin; leaf blade orbicular or broadly ovate to broadly elliptic, (5-)16.5-25 × (4-)13.2-22 cm, leathery, glabrous, both surfaces minutely glandular pitted, base usually rounded, rarely broadly cuneate, margin sinuate or sinuate-dentate, sometimes subentire, apex obtuse. Inflorescence cymose, many flowered; pedicels 5-9 mm, glabrous. Hypanthium purple, glabrous. Sepals ovate to broadly so, 4-4.5 × 3.3-5 mm, leathery, both surfaces glabrous, veins many, apex obtuse. Petals elliptic or broadly ovate to orbicular, 8-9 × 6-7.8 mm,veins pinnate, base gradually narrowed into a claw ca. 1 mm, apex obtuse. Stamens 4.5-5 mm. Ovary ovoid, ca. 4.5 mm; styles 2, ca. 5 mm. Fl. May-Sep.