Herbs perennial, glabrous, 40--60 cm tall. Stems erect, obtusely quadrangular, usually branched in upper part. Leaves opposite, sometimes alternate in upper part of stem, sessile, ovate to ovate-lanceolate or linear, 4--10 X 0.2--2.5 cm, densely dull red glandular punctate near margin, base auriculate and clasping, apex acuminate to acute; veins 6 or 7 pairs; veinlets inconspicuous. Racemes 10--15 cm; bracts subulate. Pedicel 2--4(--6) mm, ca. as long as to slightly longer than bracts. Calyx lobes lanceolate, 3.5--4 mm, ciliate, apex acuminate. Corolla white; tube ca. 1.5 mm; lobes oblong-spatulate, 3.5--4.5 X 1.2--1.5 mm, usually dark purple glandular striate, apex obtuse or subacute. Stamens included; filaments adnate to base of corolla lobes, free parts ca. 0.5 mm; anthers linear, dorsifixed, ca. 1.2 mm, red glandular at apex. Ovary glabrous; style ca. 2 mm. Capsule subglobose, ca. 3 mm in diam. Fl. May-Jun.
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