Herbs perennial. Stems erect, terete, 10--30 cm tall, simple or branched. Leaves sessile, lanceolate or linear-lanceolate, 3--5(--7) × 0.5--1(--1.5) cm, abaxially pinkish green, margin sparsely ciliate, base rounded or slightly narrowed, apex acuminate. Flowers in dichotomous cymes, glabrous; bracts lanceolate, margin membranous, apex acuminate. Pedicel 1--2 cm, longer in fruit, slender. Sepals 5, lanceolate, 4--5 mm, 3-veined, margin membranous, apex acuminate. Petals 5, slightly shorter than sepals, 2-cleft nearly to base; lobes linear. Stamens 10. Ovary ovoid; styles 3, linear. Capsule ovoid-orbicular, slightly shorter than persistent sepals, 6-valved. Seeds 2--6, brown, reniform, slightly compressed, sparsely tuberculate. Fl. Jul--Aug, fr. Sep--Oct.
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