Melandrium lhassanum F. N. Williams; Silene nyingchiensis L. H. Zhou.

Herbs perennial. Stems ascending to upright, usually violet, 30--60 cm, branched, pubescent, apically glandular hairy, with sterile leafy branches. Leaves ovate-lanceolate, 1.5--3.5 cm × 5--15 mm, both surfaces densely hairy, margin ciliate, 1- or 3-veined basally, margin undulate. Dichasial cymes densely glandular pubescent. Flowers erect, 1--1.3 cm in diam. Pedicel 5--15 mm; bracts lanceolate, 2--10 mm, herbaceous. Calyx campanulate, 1--1.2 cm × 3.5--5 mm, densely glandular hairy, truncate at base, slightly inflated in late maturity, longitudinal veins violet; calyx teeth triangular, ca. 2.5 mm. Androgynophore ca. 3.5 mm, glabrous. Petals violet, 1--1.5 cm; claws exserted beyond calyx, oblanceolate, glabrous, with broad auricles; limbs ca. 4.5 mm, bifid nearly to 1/2; lobes elliptic, margin entire. Stamens exserted; filaments glabrous. Styles ca. 8 mm, prominently exserted. Capsule ovoid, 6--8 mm, shorter than calyx. Seeds dark brown, triangular-reniform, ca. 1.2 mm. Fl. Jul--Aug, fr. Aug--Sep.

* Alpine scrub grasslands; 2900--4600 m. C and S Xizang.