Description from Flora of China
Rhododendron fongkaiense C. N. Wu & P. C. Tam.
Shrubs, deciduous, 1.5–3 m tall; young shoots densely long-setose, setae to 4 mm, and shortly glandular-setose. Summer and winter leaves different. Petiole 4–10(–18) mm, indumentum as for young shoots; leaf blade subleathery, lanceolate to oblong-lanceolate or elliptic-lanceolate, 3–8 × 2–4 cm; base cuneate; apex acuminate and mucronate; abaxial surface sparsely setose-ciliate; adaxial surface sparsely coarsely strigose along midrib and lateral veins. Inflorescence 8–9(–16)-flowered. Pedicel 0.7–1 cm, densely ferruginous setose and shortly glandular-hairy; calyx inconspicuous, lobes triangular, very small, margin long ferruginous-setose; corolla narrowly funnelform, purple-red or white, ca. 2 cm; tube narrowly oblong, ca. 10 × 1.5–2.5 mm, glabrous; lobes spreading, oblong, ca. 1 cm, apex obtuse to rounded; stamens 5, subequal, to 2.5 cm, exserted, filaments glabrous; ovary ovoid, densely long brown-setose; style to 3 cm, longer than stamens, glabrous. Capsules oblong-ovate, 5–10 mm, setose. Fl. May, fr. Jun–Dec.
Thickets; 800–1600 m. Guangdong, NE Guangxi, Guizhou, S Hunan.