Plants perennial, glabrous, 30--70 cm tall. Stems 1--3, terete or weakly quadrangular, woody, minutely brownish glandular at apex, lower part with only a few leaf scars, middle and upper parts with leaves. Leaves alternate; petiole 1--3 cm; leaf blade ovate to ovate-lanceolate or elliptic to elliptic-lanceolate, 3.5--12.5 X 1--4 cm, base attenuate, margin narrowly revolute, apex acute to acuminate; veins 5--7 pairs; veinlets inconspicuously reticulate. Pedicel nodding in fruit, 0.7--2 cm. Flowers 1 or 2, in axils of leaves or aggregated at apex of extremely abbreviated twigs and appearing clustered. Calyx 2.5--4 mm, enlarging to 6 mm in fruit; lobes ovate, apex acuminate. Corolla yellow, deeply parted; lobes lanceolate to ovate-lanceolate, 8--11 X 2.5--3.5 mm, apex obtuse. Filaments connate basally into a ring, free parts inconspicuous; anthers 7--8 mm, basifixed, opening by apical pores. Ovary ovoid; style 6--8 mm. Capsule globose 4--7 mm in diam., indehiscent.

* Forests; 900--1400 m. NW Guangxi, SW Guizhou, Hainan