Herbs perennial, 40--90 cm tall. Stems erect, elongate, becoming arching to reclining, simple or weakly short branched, rust-colored villous. Leaves opposite, occasionally alternate in upper part of stem; petiole 4--7 mm, densely rust-colored villous; leaf blade ovate-lanceolate to lanceolate, 3--6.5 X 0.8--2 cm, densely strigillose, epunctate, base subrounded, apex acute; veins 4 or 5 pairs; veinlets inconspicuous. Pedicel recurved in fruit, 0.8--1.5 cm, densely rust-colored villous. Flowers solitary, in axils of medial and upper leaves. Calyx lobes lanceolate, 5--6.5 mm, sparsely pubescent, cristate; crest ca. 0.5 mm wide, uniform in width. Corolla yellow; tube ca. 2 mm; lobes elliptic-lanceolate, ca. 8 X 3.5 mm, brown glandular striate. Filaments connate basally into a ca. 2 mm high tube, free parts 2.5--3.5 mm; anthers ovate, dorsifixed, opening by lateral slits, ca. 1.1 mm. Ovary ovoid; style ca. 6 mm. Capsule brown, globose, ca. 3.5 mm in diam. Fl. Jun.
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