Root tubers fusiform. Stems repent, decumbent, to 50 cm, slender, sparsely branched, with 2 lines of hairs. Leaves subsessile, petiole 3--5 mm; leaf blade ovate, 1.5--3 × 1--2 cm, base rounded, ciliate, apex acute. Chasmogamic flowers axillary; pedicel ca. 3.8 cm, slender, with 1 row of hairs; sepals 5, lanceolate, ca. 3 mm, abaxially pubescent at midvein; petals 5, narrowly obovate or oblanceolate, ca. 2 × as long as sepals, margin entire; stamens 10, shorter than petals; anthers purple; styles (2 or)3. Cleistogamic flowers axillary; pedicel ca. 1 cm, hairy; sepals 4, narrowly lanceolate, ca. 3 × 0.8--1 mm, pubescent; stamens reduced; styles 2. Capsule ovoid, slightly longer than sepals, 4-valved. Seeds reniform or subglobose, ca. 1.5 mm, mammillate with pointed projections. Fl. May--Jul, fr. Jul--Aug.
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