Herbs annual. Stems decumbent or ascending, quadrangular, 20--30 cm tall, pilose, nodes densely pilose. Leaves sessile, orbicular-ovate, 1.5--2.5 × 0.8--1.2 cm, base rounded, apex long acuminate. Basal leaves petiolate, withered at anthesis, abaxially midvein prominent, hairy, reticulate veins conspicuous, adaxially midvein impressed, margin shortly ciliate. Flowers in terminal cymes; peduncles 4--6 cm, glabrous; bracts ovate, 1--1.5 mm, membranous. Pedicel 1--2 cm, slender. Sepals 5, ovate-lanceolate, ca. 2.5 × 1 mm, glabrous, midvein conspicuous, margin membranous, apex acuminate. Petals 5, ca. 2 × 0.3 mm, 2-cleft nearly to base; lobes narrowly linear, narrowed at base, apex obtuse. Stamens 10; filaments linear, ca. 2 mm; anthers subglobose. Ovary ovoid-orbicular; styles 3, ca. 0.5 mm. Capsule ovoid, ca. 3 mm, 6-valved to middle. Seeds brown, oblong, ca. 0.6 mm, inconspicuously muriculate. Fl. May--Jul, fr. Jul--Aug.
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