Herbs perennial, 15--30 cm tall. Stems ascending, usually branched from base, with multicellular hairs. Leaves opposite; petiole 4--8 mm, narrowly winged; leaf blade ovate, 1.5--2.8 X 1--1.6 cm, strigillose, minutely reddish glandular punctate, base cuneate to subrounded, apex acute. Pedicel 2--4 mm, densely pubescent. Flowers solitary, axillary. Calyx lobes lanceolate, ca. 7 mm, enlarging to 1 cm in fruit, densely pubescent and reddish glandular punctate, apex acuminate-subulate. Corolla yellow; tube ca. 2 mm; lobes ovate-oblong, ca. 6 X 2.5--3 mm, sparsely red glandular, apex acute. Filaments connate basally into a ca. 1 mm tube, free parts 2.5--3.5 mm; anthers ovate, dorsifixed, opening by lateral slits, ca. 1 mm. Ovary pubescent; style ca. 4 mm. Capsule subglobose, ca. 4 mm in diam. Fl. Jun. 2n = 84.
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