Root tubers fusiform. Stems erect, 15--20 cm tall, unbranched, with 2 lines of hairs. Basal leaves lanceolate, 1.5--2.5 cm × 2--3 mm; middle and distal leaves subsessile, ovate or broadly ovate, 1.5--3 × 1--2 cm, both surfaces sparsely pubescent, base rounded, ciliate, apex acute. Chasmogamic flowers solitary or in cymes; pedicel 1.5--2.5 cm, slender, pubescent; sepals 5, lanceolate, 3--3.5 × 1.5--2 mm, with sparse long hairs at margin and abaxially at midvein, margin membranous; petals 5, obovate or broadly elliptic-obovate, ca. 5 mm, ca. 2 × as long as sepals, base attenuate, apex emarginate; stamens 10, shorter than petals, anthers purple-brown; ovary ovoid; styles 3. Cleistogamic flowers axillary; pedicel slender. Capsule ovoid, longer than sepals, 3-valved. Seeds brown, ovoid, slightly compressed, ca. 1 mm, mammillate with pointed projections, apex of projections bristly. Fl. May--Jun, fr. Jul--Aug.
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