Grey-green perennial herb, 30-80 cm. Stems ascending or decumbent, branched, glabrous or puberulent and sometimes viscid-glandular above. Leaves 1-4 x 0.1-0.2 cm., soon deciduous, linear, glandular-pubescent. Pedicels filiform, much longer than calyx. Calyx 3-6 mm., tubular, glandular-puberulent; teeth very small, ovate-rounded, white-margined. Petals longer than calyx, purplish to pink; limb 5-lobed, the middle lobe deltoid, often limb 3-lobed with middle lobe anchor-shaped; claw linear-cuneate, exserted. Capsule almost included in calyx, ellipsoid. Seeds with somewhat muricate wartlets. Fl. June-July.