Stems erect, 5--10(--20) cm tall, slender, with 2 lines of hairs. Leaves with petiole 3--20 mm; leaf blade ovate or oblong, 0.5--3 cm × 3--10 mm, adaxially pubescent, base cuneate, mar-gin ciliate with short hairs, apex obtuse, apiculate. Chasmogamic flowers solitary and terminal, or axillary; pedicel 2--3 cm, with 1 line of hairs; sepals 5, lanceolate, 5--6 mm, long acuminate, subglabrous; petals 5, cuneate-obovate, slightly longer than sepals, margin entire; stamens 10; ovary ovoid; styles 3, ca. 3 mm. Cleistogamic flowers axillary, small, subsessile; sepals 4, 3--4 mm, with long hairs; petals absent. Capsule globose, 2.5--4 mm. Seeds brown, elliptic, ca. 1 mm, tuberculate. Fl. May--Jun, fr. Jul.
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