Herbs perennial, 7--25(--45) cm tall. Stems erect or arcuate at base, terete or slightly angulate, simple or short branched in upper part, with multicellular hairs. Leaves opposite, upper 2 or 3 pairs usually ± crowded; petiole 3--12 mm, narrowly winged. Lower leaves rhomboid-ovate to ovate, much smaller. Upper leaves ovate, rarely ovate-lanceolate, 2--8 X 0.8--2.5 cm, densely strigillose and sparsely transparent glandular, base subrounded to broadly cuneate, apex acute to subobtuse; veins 2 or 3 pairs; veinlets inconspicuous. Racemes terminal, abbreviated, often nearly capitate. Pedicel recurved in fruit, 4--10(--18) mm. Calyx lobes lanceolate, 8--11 X 1--1.5 mm, abaxially pubescent, costate. Corolla yellow; tube 3--4 mm; lobes narrowly elliptic to obovate-elliptic, 7--11 X 5--6 mm, transparent glandular, apex acute to obtuse. Filaments connate basally into a 2--3 mm high tube, free parts 3--5 mm; anthers dorsifixed, opening by lateral slits. Ovary and lower part of style pubescent; style 5--6 mm. Capsule subglobose, 3--3.5 mm in diam. Fl. May-Jun.
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