Herbs annual. Stem solitary, nearly erect, 15--30 cm tall, slender, apically branched, glabrous or sparsely pubescent. Leaves with petiole short, ca. 2 mm; leaf blade linear-lanceolate, 1--2 cm × 3--5 mm, both surfaces glabrous, 1-veined, base broadly cuneate, margin sometimes slightly undulate, apex acuminate. Flowers axillary, solitary or in cymes. Pedicel 1--2.5 cm. Sepals 5, lanceolate, sometimes with sparse, purplish stiff hairs. Petals 5, ca. 1.5 × as long as sepals, 2-cleft nearly to base. Stamens 5; filaments slender. Ovary ellipsoid; styles 3, shortly linear, slightly shorter than ovary. Capsule globose, 6-valved. Fl. Apr--May, fr. Jun--Sep.

* Slopes. Hubei, Sichuan.