Boea swinhoei Hance, Ann. Sci. Nat. Bot., ser. 5, 5: 231. 1866.

Subshrubs. Stems 30-60 cm, densely brownish woolly, glabrescent. Leaves opposite, spread along stem; petiole 1-5 cm; leaf blade narrowly elliptic to elliptic-lanceolate, narrowly ovate, or narrowly obovate, 4-14 X 2-5 cm, papery, adaxially grayish woolly, glabrescent, abaxially brownish pannose, base sometimes oblique, cuneate to subcordate, margin subentire to serrate, apex abruptly acuminate to rounded; lateral veins 5-11 on each side of midrib. Cymes appearing terminal; peduncle 5-13 cm, brownish woolly; bracts 2, ovate-oblong, 3-10 mm, outside brownish pannose. Pedicel 5-8 mm. Calyx 1.5-2.5 mm, 5-sect from near base; segments narrowly oblong, 1.2-2.3 X 0.5-1 mm, outside pannose to glabrous. Corolla white, 4-6 mm, outside glabrous; tube 3-4 mm; adaxial lip 1.5-3 mm, lobes 1-2.5 X ca. 3.5 mm; abaxial lip 3-3.5 mm, lobes 2-2.5 X 2.5-3.5 mm. Filaments 2-3 mm, glabrous; anthers ca. 2 mm; staminodes 2 or 3, ca. 1.5 mm. Pistil glabrous; ovary 2.5-3 mm. Style 3-4 mm. Capsule spirally twisted, 2-2.5 cm, glabrous. Fl. Jun-Sep, Feb, fr. Jul-Sep.

Shady and damp rocks under forests; 300-1000 m. Guangxi, S Guizhou, Taiwan [Philippines, Thailand, Vietnam].