Herbs perennial, 30--60(--100) cm tall. Stems erect or prostrate in lower part, ± rust-colored villous. Branches usually shorter than subtending leaves, with leaves only at apex. Leaves opposite; petiole 0.8--2 cm, narrowly winged; leaf blade ovate to ovate-lanceolate, 4--9.5 X 2--3.8 cm, ciliate, sparsely strigillose, densely black or brown glandular striate, base subrounded to broadly cuneate, apex acute to short acuminate; veins 4 or 5 pairs; veinlets inconspicuous. Inflorescences subcapitate, terminal on branches, seldom on main axis, 3--5-flowered; bracts leaflike, ovate to suborbicular, 8--12 X 6--10 mm, apex apiculate. Pedicel 1--2 mm. Calyx lobes lanceolate, 8--9 X 1.2--1.5 mm, glabrous or sparsely puberulous, black glandular striate. Corolla yellow; tube 3--4 mm; lobes narrowly oblong, 10--11 X 3.5--5 mm, black or brown glandular striate, apex obtuse to acute. Filaments connate basally into a ca. 3 mm high tube, free parts 3--5 mm; anthers oblong, dorsifixed, opening by lateral slits, ca. 1.5 mm. Ovary pubescent on upper part; style ca. 7 mm. Capsule subglobose, ca. 3 mm in diam. Fl. May.
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