Herbs perennial, 20--60 cm tall. Stems erect, terete, branched in upper part, rust-colored pilose. Branches usually shorter than subtending leaves, leafy only near apex. Leaves opposite; petiole 0.7--2 cm, narrowly winged, densely pilose; leaf blade ovate, 2.5--5 X 1.4--3 cm, sparsely bristly, densely transparent glandular punctate, base subrounded, apex acute to short acuminate; veins 5 or 6 pairs. Racemes terminal, abbreviated or capitate, 2--6-flowered; bracts leaflike, ovate. Pedicel 2--4 mm, densely pubescent. Calyx lobes lanceolate, ca. 5.5 X 1 mm, sparsely pubescent, transparent glandular punctate. Corolla yellow; tube ca. 2.5 mm; lobes oblong, ca. 7.5 X 4 mm, sparsely transparent glandular punctate, apex acute to subobtuse. Filaments connate basally into a ca. 2 mm high tube, free parts ca. 3 mm; anthers dorsifixed, opening by lateral slits, ca. 1.5 mm. Ovary pubescent apically. Style ca. 5 mm. Capsule globose, ca. 3 mm in diam.
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