Herbs perennial, to 90 cm. Stems erect, elongate, becoming arching to reclining, shortly branched, initially with rust-colored multicellular hairs, glabrate. Leaves opposite; petiole 3--10 mm, rust-colored pubescent; leaf blade lanceolate, 3--7 X 1--2 cm, abaxially sparsely pubescent, becoming glabrescent, except on veins, obscurely brown or black glandular striate, adaxially glabrous, base rounded, apex acute to acuminate; veins 3 or 4 pairs; veinlets inconspicuous. Pedicel 1--1.5 cm, rust-colored pubescent. Flowers solitary, axillary. Calyx lobes lanceolate, 5--6 mm, abaxially cristate; crest widest at base (ca. 2 mm), glabrous, brown glandular striate. Corolla yellow; tube ca. 2 mm; lobes lanceolate, 7--8 X 2.5--3 mm, sparsely brown glandular striate, apex acute. Filaments connate basally into a ca. 2 mm high tube, free parts 4--5 mm; anthers oblong, dorsifixed, opening by lateral slits, ca. 1.2 mm. Ovary glabrous; style ca. 5 mm. Capsule unknown. Fl. May-Jun.
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