Herbs, perennial, 25-60 cm tall. Rhizomes horizontal, coarse. Stems erect, glabrous, or bilaterally puberulent above. Lower leaves crowded, spatulate or weakly petiolate, glabrous; petiole to 5 cm; blade oblanceolate or oblong, to 25 × 6 cm, base attenuate, margin coarsely serrate, apex acuminate. Cauline leaves petiolate; petiole 1-3.5 cm; blade linear to linear-lanceolate, 4.5-9 × 0.5-1.5 cm, glabrous, base cuneate-decurrent, margin entire or coarsely serrate, apex acuminate. Inflorescence corymbiform-paniculiform; lateral branches in 4-6 pairs, with 2 lines of dense, stiff hairs; pedicels reduced. Calyx lobes inconspicuous. Corolla yellow, ca. 5 mm, regularly 5-lobed; lobes spreading. Stamens 4, exserted. Style ca. 2.5 mm; stigma capitate; fertile ovary locule slightly compressed, ellipsoid, densely hispidulous or subglabrous below and above margin. Achenes oblong, 2.5-3 mm; bracteoles elliptic or obovate-elliptic, ca. 3 × 1.5 mm, to obovate or orbicular, 3-7 × 2.5-6 mm, 3-veined, apex rounded, sinuate or with 3 rounded lobes. Fl. Jul, fr. Aug.
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