Plants perennial, erect to straggling, rarely clumped, never compact and cushion-forming, from slender rhizomes. Stems erect, diffusely branched, rarely elongate and straggling, branched mainly at base, 4-sided, 9-20 cm, glabrous. Leaves sessile; blade green, never glaucous, linear to linear-lanceolate, widest at or near middle, 2.7-3.5 cm × 2-3 mm, not succulent, base cuneate, margins entire, apex gradually acuminate, acute, glabrous with few cilia at base. Inflorescences with flowers solitary, terminal or axillary in distal foliage leaves. Pedicels erect, 18-50 mm, glabrous. Flowers 7-10 mm diam.; sepals 5, midrib prominent, lateral veins obscure, ovate-lanceolate to lanceolate, 4-6 mm, margins narrow, membranous, apex acute, glabrous; petals 5, 4-6 mm, equaling or slightly longer than sepals, blade apex deeply divided into 2 oblanceolate lobes; stamens 10; styles 3, ascending, curled at tip, 2-3 mm. Capsules black, oblong, 6-8 mm, slightly longer than sepals, apex obtuse, opening by 6 valves; carpophore absent. Seeds dark brown, broadly ovate, 0.8-1 mm diam., shallowly tuberculate. 2n = 26.
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