Herbs perennial. Stems diffuse or decumbent, quadrangular, 30--100 cm tall, slender, glabrous. Leaves shortly petiolate or sessile; petiole villous; leaf blade ovate to ovate-lanceolate, 3--4 × 1--1.6 cm, both surfaces glabrous, midvein conspicuous abaxially, base broadly cuneate or nearly rounded, apex acuminate. Flowers in sparse cymes; peduncles slender; bracts membranous. Pedicel ca. 1 cm or longer, slender. Sepals 5, lanceolate, 3--4 mm, margin membranous, apex acuminate. Petals 5, nearly as long as sepals, 2-cleft nearly to base. Stamens 10, slightly shorter than petals. Styles 3. Capsule ovoid, slightly longer than or subequaling persistent sepals, 6-valved. Seeds brown, ovoid, slightly compressed, papillate. Fl. May--Jun, fr. Jul--Aug.
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