Herbs perennial, 25--50 cm tall. Stems distally branched, scabrous or subglabrous. Leaves linear, 2.5--4 cm × 2--3 mm, base connate into a 1--2 mm sheath, margin scabrous, apex acute. Flowers 1 or 2, terminal; bracts (4 or)6(or 8), ovate, ca. 1/2 as long as calyx, apex long acuminate-caudate. Calyx cylindric, slightly inflated at middle, 1.6--2 cm × 5--7 mm; teeth ovate, margin membranous, ciliate, apex mucronate. Petals adaxially light purple-red or pink, abaxially yellowish green; limb 0.8--1.2 cm × 5--8 mm, adaxially hairy, apex irregularly toothed. Ovary oblong. Styles linear. Capsule shorter than calyx, apex 4-toothed. Fl. and fr. Jul--Aug.
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