Herbs perennial, glabrous, 40--80 cm tall. Stems erect, quadrangular, winged on ridges, branched in upper part. Basal leaves spatulate, early deciduous. Stem leaves opposite, sessile, lanceolate to linear-lanceolate, rarely oblong-lanceolate, 4--13 X 1--3 cm, densely minutely black glandular punctate, base obtuse to auriculate and semi-clasping, apex acute to obtuse. Racemes terminal; bracts leaflike. Pedicel 3--5 mm, ca. as long as to shorter than bracts. Calyx lobes linear-lanceolate, 4--5 mm, black glandular punctate and striate outside. Corolla white, ca. 7 mm; tube ca. 2.5 mm; lobes ovate-oblong. Stamens ca. as long as corolla; filaments adnate to middle of corolla, free parts ca. 3 mm; anthers linear, dorsifixed, ca. 1.5 mm, with a callus at apex. Ovary glabrous; style ca. 6 mm. Capsule subglobose, ca. 3 mm in diam. Fl. May-Jul.
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