Herbs perennial, 30--100 tall. Stems ascending to erect, arcuately elongate in upper part, distinctly quadrangular, with short wings or ridges. Leaves opposite; petiole 4--7 mm, narrowly winged by decurrent leaf blade; leaf blade ovate, 1--4 X 1.2--2.6 cm, abaxially glabrous, adaxially ± bristly, base cordate, margin densely papillate, apex short acuminate; veins 3--5 pairs, basal, prominent. Pedicel filiform, 2.5--4.3 cm. Flowers solitary, axillary. Calyx lobes ovate, 4--6.5 mm, stalked glandular on margin and inside, apex acuminate to subulate. Corolla yellow, ca. 6 mm, deeply parted; tube ca. 1.5 mm; lobes broadly ovate, 4--4.5 mm wide. Filaments connate basally into a ca. 0.8 mm high ring, free parts ca. 0.5 mm; anthers ca. 2.3 mm, basifixed, opening by short slits. Style ca. 4 mm. Capsule subglobose, ca. 4.5 mm in diam. Fl. Jun.
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