Herbs perennial, 15--50 cm tall. Stems ascending-erect from prostrate base, subterete, branched in upper part, fulvous-villous. Leaves opposite, rarely in whorls of 3, or alternate in upper part of stem, upper 2 pairs crowded; petiole 2--10 mm; leaf blade ovate, 1.1--3.7 X 0.7--2.5 cm, with appressed articulate hairs, base subrounded, apex acute; veins 2 or 3 pairs, prominent abaxially. Pedicel 3--8 mm, pubescent. Flowers 2 or 3, solitary in axils of aggregated upper leaves, forming a loose terminal capitate cluster. Calyx lobes linear-lanceolate, 7--10 X 1.5--2 mm, abaxially fulvous pilose, transparent glandular punctate. Corolla yellow; tube 3--4 mm; lobes broadly lanceolate, 10--11 X 5--6 mm, transparent glandular punctate, adaxially dull red at base, apex acute. Filaments connate basally into a ca. 2 mm high tube, free parts ca. 3 mm; anthers oblong, dorsifixed, opening by lateral slits, ca. 2 mm. Ovary pubescent; style ca. 8 mm, sparsely pilose. Capsule subglobose, ca. 4 mm in diam. Fl. May-Jul.
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