Herbs perennial, glabrous. Stems solitary or tufted, slightly quadrangular, 15--25 cm tall, slender, simple or branched, usually glabrous. Leaves sessile, linear-lanceolate or linear, 2.5--6 cm × 2.5--4 mm, both surfaces glabrous, pubescent at base, midvein raised, base slightly semiclasping, apex long acuminate. Flower solitary, terminal; bracts lanceolate, margin membranous, apex acuminate. Pedicel 1.5--5.5(--8) cm, slender. Sepals 5, ovate-lanceolate, ca. 5 × 2.5 mm, glabrous, midvein conspicuous, margin white, membranous, apex acuminate. Petals 5, ca. 1.2 × as long as sepals, 2-cleft nearly to base; lobes oblong-oblanceolate, apex obtuse. Stamens 10, 1--1.2 mm; anthers yellow. Ovary ovoid; styles 3. Capsule brown or nearly black, cylindric-ovoid, longer than persistent sepals, 6-valved. Seeds brown, reniform-orbicular or ovoid, slightly compressed, minute, tuberculate. Fl. Jun--Jul, fr. Aug--Sep.
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