Herbs perennial, 60--120 cm tall, with creeping rhizomes. Stems erect, terete or obtusely quadrangular, simple or paniculately branched, pubescent. Leaves opposite or whorled; petiole 2--10 mm; leaf blade oblong-lanceolate to ovate-lanceolate, 6--17 X 1--5 cm, abaxially glabrescent, sparsely red or black glandular punctate, abaxially pubescent, base obtuse to subrounded, margin entire or obscurely repand, apex acuminate; veins to more than 10 pairs; veinlets prominent. Panicles terminal and axillary; peduncle 1.5--4.5 cm; bracts linear-subulate, 2--8 mm. Pedicel 3--12 mm. Calyx lobes lanceolate, 3.5--6 X 1--1.5 mm, margin black glandular striate and glandular ciliate. Corolla bright yellow, 8--11 mm, 1.5--2 cm in diam., deeply parted; lobes elliptic, 7--10 X 3.5--6 mm, adaxially densely glandular. Filaments connate basally into a ca. 1.5 mm high ring, free parts ca. 2.5 mm; anthers linear, dorsifixed, opening by lateral slits, ca. 3 mm. Ovary ovoid, style 4--5 mm. Capsule subglobose, 3--4 mm in diam. Fl. Jul-Aug. 2n = 28, 42, 56, 70, 84 (85, 86).

Ditches, marshes; 500--700 m. W Xinjiang [Kashmir, Kazakhstan, Pakistan, Russia; NW Africa, SW Asia, Europe; North America].