Herbs or subshrubs, perennial. Rootstock slightly woody. Stems branching near base, ascending, 20--30 cm, pilose. Stipules white, long triangular, 1.5--2 mm, scarious. Leaves opposite or apparently verticillate; leaf blade narrowly oblong to oblong-elliptic, 5--20 × 1--3.5 mm, distinctly shorter than internode, glabrous, mostly sharply reflexed from base, apex obtuse, mucronate. Cymes rather lax; bracts scarious. Pedicel mostly short, to 5 mm in fruit, with sparse long hairs. Flowers ca. 4 mm. Sepals white, with thick brown veins near base, ovate, ca. 3 × 1.5 mm, apex acuminate. Petals white, with purple-brown veins, longer than sepals. Stamens usually 5, subequaling sepals. Style filiform, 1--2 × as long as ovary. Capsule brown, ovoid, ca. 3 mm, glossy. Seed brown, ca. 0.7 × 0.3 mm. Fl. May--Jul, fr. Aug--Oct.
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