Rootstock a subglobose tuber to 3 cm in diam., with thickened roots. Stems erect, to 50 cm, dichotomous, basal part leafless. Petiole 4-6 mm, crisped-pubescent; leaf blade ovate-triangular, 5-15 × 3-10 mm, somewhat fleshy, adaxially crisped-pubescent, abaxially sparsely pubescent on veins, base cordate or subhastate, margin revolute, apex acuminate; lateral veins obscure. Inflorescences monochasial, 1-3-flowered. Pedicel 3-10 mm, minutely puberulent. Sepals linear-lanceolate, ca. 2 × 1 mm, puberulent to glabrous. Corolla 1-1.5 cm, sparsely pilose outside, glabrous inside; tube 7-10 mm; lobes ovate to subrhomboid, 3-5 mm, joined for half length to form flat "roof" with short central mucro. Outer corona lobes triangular, joined into cup, glabrous; inner corona lobes ligulate or linear-spatulate, twice as long as outer lobes. Follicles fusiform, ca. 4.5 cm. Seeds ca. 5 mm. Fl. Jul-Aug, fr. Sep-Oct.