Herbs perennial, 15--30 cm tall. Stems obtusely quadrangular, usually branched above middle, densely brownish pubescent. Lower leaves suborbicular to scalelike, base clasping, apex obtuse. Upper leaves opposite, sessile, ovate-elliptic to oblong-lanceolate, 3--6 X 1--1.8 cm, minutely glandular punctate, initially bristly, becoming glabrescent, base rounded to broadly cuneate, apex subobtuse to acute; veins 4 or 5 pairs; veinlets inconspicuous. Pedicel 5--10 mm. Flowers solitary, in axils of medial and upper leaves. Calyx lobes lanceolate, ca. 5 X 1 mm, pubescent, costate. Corolla yellow, rotate, 1--1.5 cm in diam.; tube ca. 1 mm; lobes obovate-elliptic, ca. 5 X 3--4 mm, apex rounded. Filaments connate basally into a ca. 0.5 mm high ring, free parts ca. 2 mm; anthers linear, dorsifixed, opening by lateral slits, 1--1.5 mm. Ovary ovoid; style ca. 3 mm. Capsule subglobose, ca. 3 mm in diam. Fl. May-Jun.
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