Herbs annual, glabrous, to 50 cm tall. Stems erect, obtusely quadrangular, usually simple. Leaves alternate; petiole 0.5--2 cm, narrowly winged; leaf blade lanceolate, 2.5--5.5 X 0.9--1.8 cm, black glandular striate along midvein and margin, base attenuate, apex acuminate; veins 5 or 6 pairs, slightly raised abaxially. Racemes initially coniform, gradually elongating to 15 cm in fruit, densely flowered; bracts linear, 4--7 mm, black striate on margin. Pedicel slightly angular, ca. 5 mm, elongating to 8 mm in fruit. Calyx lobes lanceolate, ca. 3.5 X 0.8 mm, abaxially with 2 vertical glandular stripes, margin membranous, apex subobtuse. Corolla pink; tube ca. 1.5 mm; lobes obovate, 4.5--5.5 X 2.5--3 mm, with 2 parallel red glandular stripes at middle, apex rounded. Stamens included; filaments adnate to base of corolla lobes, free parts ca. 1 mm; anthers elliptic, dorsifixed, ca. 1 mm. Ovary ovoid; style ca. 2 mm. Capsule subglobose, 3--3.5 mm in diam. Fl. May-Jun.
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