Herbs perennial, 15--45 cm tall. Stems erect, subterete, usually simple, with dense rust-colored multicellular hairs. Leaves 6 to many per terminal whorl, 3 or 4 per whorl or opposite at lower nodes, rarely alternate, sessile or subsessile, lanceolate to narrowly lanceolate, 2--5.5(--11) X 0.5--1.2(--2.5) cm, with multicellular hairs, base cuneate, apex acuminate to subobtuse. Umbels terminal, rarely with flowers in axils of lower leaves. Pedicel recurved in fruit, 7--12 mm, sparsely pubescent. Calyx 9--10 mm; lobes lanceolate, abaxially sparsely pubescent, apex acuminate-subulate, costate. Corolla yellow, 1.1--1.2 cm; tube 2.5--3 mm; lobes narrowly elliptic, ca. 5 mm wide, brown or black glandular striate, apex obtuse. Filaments connate basally into a ca. 2.5 mm high tube, free parts 2--3 mm; anthers ovate, dorsifixed, opening by lateral slits, ca. 1.5 mm. Ovary ovoid; style ca. 5 mm. Capsule subglobose, 3--4 mm in diam. Fl. May-Jul.
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