Herbs perennial, 40--80 cm tall. Stems erect, basally branched, glabrous, large jointed. Basal leaves several, withered at anthesis; cauline leaves linear-lanceolate or lanceolate, 4--10 cm × 2--5(--10) mm, base connate into a short sheath, margin serrulate, apex acuminate. Flowers 2 to several in lax cymes; bracts 6 or 8, appressed, leaflike, ovate, ca. 1/5 as long as calyx, margin broadly membranous, scabridulous, apex mucronate. Calyx green, long tubular, 3--4 cm, striate, glabrous; teeth lanceolate, 5--6 mm, apex sharply pointed. Petals pink, obovate or cuneate-oblong; limb fimbriate for ca. 1/2 its length. Stamens level with corolla throat. Styles linear, ca. 2 cm. Capsule narrowly cylindric, slightly shorter than calyx, 4-toothed. Fl. Jun--Aug, fr. Aug--Sep.
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