Herbs perennial, 20--50 cm tall. Stems caespitose, erect, much-branched, slender, subglabrous or pilose. Leaves linear, 1--4 cm × 1--1.5 mm, base connate into a 1--2 mm sheath, margin slightly revolute, apex sharply pointed. Flower solitary, terminal; pedicel 1--2 cm; bracts 4(or 6), elliptic, ca. 1/3 as long as calyx, leathery, margin membranous, apex mucronate. Calyx cylindric, 1.2--1.4 cm × ca. 3 mm; teeth triangular, margin membranous. Petals white; limb obovate, 5--6 × 3--3.5 mm, throat pilose, apex irregularly toothed. Ovary suboblong. Styles linear. Capsule cylindric, ca. 1.5 cm × 3.5 mm, apex 4-valved. Fl. and fr. Sep.
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