Herbs perennial, (5--)15--50 cm tall, densely strigillose. Stems erect or ascending, terete, often branched. Leaves opposite, short petiolate or sessile, ovate to linear-lanceolate, 1.5--9 X 0.3--2.5 cm, sparsely transparent glandular, base cuneate, apex acuminate, rarely acute to subobtuse; veins 4 or 5 pairs; veinlets inconspicuous. Lowest pedicels recurved in fruit, to 2 cm, gradually reduced to 4--7 mm. Flowers solitary, in axils of upper leaves, occasionally flowers ± aggregated toward apex, racemose from reduction of upper leaves to bractlike leaves. Calyx lobes lanceolate, 6--8 X 1--1.5 mm, transparent glandular punctate, apex acuminate-subulate, costate. Corolla yellow, 5--9 mm; tube 1--2 mm; lobes obovate-elliptic, apex rounded. Filaments connate basally into a ring or thin tube, free parts 3--5 mm; anthers dorsifixed, opening by lateral slits. Style ca. 6 mm, rust-colored pubescent on lower part and ovary apex. Capsule brown, subglobose, 3--4 mm in diam.
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