Description from Flora of China
Small multi-branched shrubs, 1–3 m tall; young shoots fine and erect, densely coarsely brown strigose, hairs flattened. Leaves all similar. Petiole 3–6 mm, coarsely strigose; leaf blade subleathery, linear-lanceolate to narrowly lanceolate, 2–4 × 0.3–1.1 cm; base cuneate; margin slightly revolute and shallowly undulate; apex acute and mucronate; abaxial surface sparsely coarsely pale yellow-brown strigose. Inflorescence 1–3-flowered. Pedicel 0.5–0.8 cm, densely brown strigose; calyx lobes unequal, long-ovate, outer surface and margin villous, apex rounded or acuminate; corolla funnelform, red, 3.5–4.5 cm; tube cylindric, ca. 1.8 cm, both surfaces glabrous; lobes spreading, obovate, apex rounded; stamens 10, unequal, partly exserted, filaments linear, pubescent below; ovary ovoid, densely coarsely yellow-brown appressed setose; style longer than stamens, glabrous. Capsules ovoid, 8–10 mm, glabrescent. Fl. Oct–Dec.
Forest margins, riversides; 300–500(–1300) m. S Guangxi, Hainan.