Herbs annual, glabrous, 30--50 cm tall. Stems erect, angular, branched in upper part. Leaves alternate; petiole 1/3--1/2 as long as leaf blade, narrowly winged; leaf blade ovate-lanceolate to elliptic-lanceolate, 2--6 X 1--2 cm, thick black glandular striate near margin, base cuneate, apex acuminate. Racemes 8--15 cm, laxly flowered; bracts subulate-lanceolate; lowest bracts leaflike, gradually reduced upward. Pedicel 1.5--2.5(--4) mm, slightly shorter than bracts. Calyx lobes lanceolate, ca. 3 mm, glandular ciliate, thick brown glandular striate outside, margin membranous, apex obtuse, costate. Corolla white, 3.5--5 mm, parted to 2/3; lobes elliptic, apex obtuse. Stamens included; filaments adnate to base of corolla lobes, free parts ca. 0.5 mm; anthers dorsifixed. Ovary glabrous; style ca. 1 mm. Capsule subglobose, 4--5 mm in diam. Fl. Jun-Jul.
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