Herbs perennial, glabrous, 45--70 cm tall. Stems erect, obtusely quadrangular, branched in upper part. Leaves opposite, sometimes alternate in upper part of stem; petiole 0.5--1.5 cm, narrowly winged; leaf blade lanceolate to elliptic-lanceolate or elliptic, 5--10 X 1.5--3 cm, abaxially very densely and minutely rust-colored glandular and sparsely dull red or black glandular punctate near margin, base cuneate, apex acute; veins 6 or 7 pairs; veinlets inconspicuous. Racemes 5--15 cm; bracts lanceolate, lower bracts often longer than pedicels, gradually reduced upward to subulate, 2.5--4 mm. Calyx lobes ovate-lanceolate, 3--4 mm, ciliate, abaxially with 2--4 thick glandular stripes, apex acute. Corolla white; tube ca. 2 mm; lobes rhomboid-ovate, 2.5--3.5 mm, brown glandular striate, apex acute. Stamens included; filaments adnate to base of corolla lobes, free parts ca. 1 mm; anthers ovate, dorsifixed, less than 1 mm, red glandular at apex. Ovary glabrous; style ca. 2 mm. Capsule globose, ca. 3 mm in diam. Fl. May-Jun.
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