Herbs perennial. Roots robust, woody. Stems pulvinate, densely branched, 4--8 cm, glabrous. Leaves crowded; leaf blade subulate-linear, 0.8--2 cm, with 1 raised vein, base broadened, margin sheathing, incrassate, membranous, hairy, apex cuspidate. Flower solitary, terminal, sessile, ca. 1.8 cm in diam. Sepals 5, lanceolate or ovate-lanceolate, 7--8 × ca. 2 mm, closely 3-veined, base broadened, margin broadly membranous, apex acute. Petals 5, white, broadly ovate, 0.9--1.2 cm, base clawed, apex obtuse. Stamens 10; filaments shorter than sepals, those opposite sepals with a gland at base. Ovary ovoid. Styles 3, linear. Capsule ovoid, shorter than persistent sepals, 3-valved; valves 2-cleft at apex. Seeds obovoid-reniform. Fl. Jun--Jul, fr. Jul--Aug.
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