Root tubers globose or broadly ellipsoid, ca. 1 cm. Stems erect, 5--10 cm tall, slender, unbranched, or sparsely branched apically, glabrous or with 1 or 2 lines of short hairs. Leaves lanceolate or ovate-lanceolate, 1--3 cm × 3--8 mm, base attenuate into a short petiole, glabrous or ciliate, apex acute. Chasmogamic flowers terminal or axillary; pedicel 1.5--2.5 cm, slender, glabrous or pubescent; sepals 5, oblong-lanceolate, veins pilose, margin membranous; petals 5, oblong, ca. 1.5 × as long as sepals, margin entire, rarely emarginate; stamens 10, subequaling petals; styles (2 or)3. Cleistogamic flowers axillary, small; pedicel ca. 1.2 cm; sepals 4; petals absent; stamens 2; styles 2 or 3. Capsule ellipsoid, ca. 4 × 3 mm. Seeds brown, ovoid, ca. 1.5 mm, with anchor-shaped barbs. Fl. May--Jun, fr. Jul--Sep.
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