Herbs perennial, 20--50 cm tall. Stems erect or arcuate at base, terete or obscurely quadrangular in upper part, simple or weakly branched, fulvous pilose. Lowest 1 or 2 pairs of leaves smaller or scalelike. Leaves opposite, occasionally alternate on upper part of stem; petiole 0.5--2 cm, narrowly winged; leaf blade ovate-lanceolate, rarely ovate, 3--7 X 1--3 cm, abaxially sparsely pubescent or glabrescent except on villous veins, minutely glandular punctate, adaxially strigillose, base cuneate-attenuate, rarely subrounded, apex acute to short acuminate. Lowest pedicels ascending in fruit, to 3 cm, gradually reduced upward. Flowers solitary, in axils of apically diminishing leaves, racemose. Calyx lobes lanceolate, 6--8 X 1.2--2 mm, pubescent. Corolla yellow; tube ca. 4 mm; lobes obovate-oblong, 6--8 X 5--6 mm, transparent glandular, apex rounded. Filaments connate basally into a ca. 3 mm high tube, free parts 2--3 mm; anthers oblong, dorsifixed, opening by lateral slits, ca. 1.5 mm. Ovary and lower part of style pubescent; style 5--6 mm. Capsule subglobose, ca. 4 mm in diam. Fl. Jul-Aug.
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