Herbs annual. Stems sparsely tufted, slightly diffuse at base, erect above, 10--20 cm tall, multibranched, glabrous. Leaves with petiole 1--2 cm; leaf blade ovate-cordate to ovate, 2--3.5 × 1.5--2 cm, abaxially greenish, both surfaces glabrous or adaxially sparsely hirsute, midvein protuberant, base cordate or narrowed into long petiole, asymmetric, margin glabrous or ciliate, apex acute. Flowers several, usually 1--3 in terminal or axillary cymes; bracts herbaceous. Pedicel 2--6 cm, 4--10 × as long as sepals, glabrous or sparsely pubescent. Sepals 5, lanceolate, 5.5--6 mm, 1-veined, margin membranous, apex acute. Petals 5, obcordate, ca. 8 mm, apex 2-cleft to 1/3 of sepals. Stamens (7--) 10, shorter than petals. Styles (2 or)3(or 4). Axillary flower at middle or proximal parts of inflorescences female; stamens absent or sometimes both petals and stamens absent; styles 2. Capsule ovoid, subequaling persistent sepals. Seeds 3--5, brown, orbicular-reniform, tuberculate. Fl. Apr--Jun, fr. Jun--Jul.
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