Herbs perennial, 30--70 cm tall. Stems erect, terete, usually branched above middle. Leaves alternate, sometimes opposite on lower part of stem; petiole ca. 1 cm; leaf blade lanceolate, 5--8 X 1--1.2 cm, abaxially very densely minutely rust-colored glandular, base attenuate, apex acuminate. Racemes terminal, densely flowered; bracts subulate. Pedicel 5--7 mm, ca. as long as to longer than bracts, densely glandular. Calyx lobes lanceolate, 5--6 mm, abaxially black striate, margin membranous, apex slightly recurved. Corolla white or pink; tube ca. 2 mm; lobes suborbicular, ca. 4 mm, base clawed, occasionally with 2 dark purple glandular stripes at middle; sinus between lobes rounded. Stamens long exserted; filaments adnate to base of corolla lobes, free parts 3--4 mm; anthers elliptic, dorsifixed, ca. 1 mm. Ovary glabrous; style ca. 6 mm. Capsule subglobose, 4--5 mm in diam. Fl. Jun-Jul.
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