Herbs perennial, 25--40 cm tall. Stems purplish, procumbent, usually simple; upper part erect, subterete, slightly swollen at nodes, glabrous, young parts densely minutely brown glandular. Leaves opposite; petiole 1.3--2 cm, narrowly winged, base auriculate; leaf blade ovate to ovate-lanceolate, 4--9.5 X 2--4 cm, abaxially subglabrous, adaxially densely bristly, becoming glabrescent, base subrounded, apex acuminate; veins bristly, minutely red glandular punctate, 6--9 pairs; veinlets inconspicuous. Racemes axillary, lax, corymbiform, 2--4-flowered; peduncle 1--4 cm; bracts subulate, 4--7 mm. Pedicel 0.8--2 cm, sparsely glandular. Calyx lobes lanceolate, 7--9 mm, glabrous, densely red glandular punctate, midvein distinctly raised abaxially. Corolla yellow, 8--10(--13) mm; tube ca. 1.7 mm; lobes elliptic, red glandular punctate, apex rounded. Filaments connate basally into a ca. 2.5 mm high tube, free parts 2.5--4.5 mm; anthers oblong, dorsifixed, opening by lateral slits, ca. 1.5 mm. Ovary glabrous; style to 6 mm. Capsule subglobose, ca. 4 mm in diam. Fl. Jul-Aug.
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