Herbs perennial. Stems erect or ascending, quadrangular, 20--30 cm tall, usually simple, glabrous. Leaves lanceolate, 3--6 cm × 4--12 mm, abaxially gray-green, hairy at base, base cuneate, slightly clasping, margin cartilaginous, usually undulate, apex acuminate. Flowers in sparse terminal cymes; peduncles ca. 5 cm; bracts lanceolate, 1--2 mm, membranous. Pedicel 1--2.5 cm, slender, glabrous. Sepals 5, lanceolate, 4--5 mm, conspicuously 3-veined, base slightly rounded, margin membranous, apex long acuminate. Petals 5, slightly shorter than sepals, 2-cleft nearly to base; lobes narrowly linear. Stamens 10, slightly shorter than petals; anthers brown, cylindric. Ovary ovoid-orbicular; styles 3, linear. Capsules ovoid-orbicular, slightly shorter than or subequaling persistent sepals, 6-valved. Seeds narrowly ovoid-orbicular, ca. 1 mm, rugulose. Fl. May--Jun, fr. Jul--Aug.
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