Trigonostemon chinensis f. fungii (Merrill) Y. T. Chang; T. fungii Merrill; T. harmandii Gagnepain; T. huangmosu Y. T. Chang; T. leucanthus Airy Shaw var. hainanensis H. S. Kiu; T. wui H. S. Kiu.

Shrubs 2-4 m tall; young branches with densely yellow-brown pubescence, glabrescent at maturity. Petiole 1-2 cm, hispidulous to glabrescent, with 2 conical glands; leaf blade obovate-elliptic to oblong, 8-18 × 3-5.5 cm, thinly papery, hirsute or villous on both surfaces when young, glabrous or glabrescent at maturity, usually densely tuberculate adaxially, base cuneate to rounded, margins entire or obscurely serrulate at upper part, apex acute, usually attenuate into cauda; lateral veins 6-8. Racemes terminal, 9-18 cm, branching, spreading, pilose or hispidulous to glabrescent. Male flowers: pedicel delicate, 2-5 mm; sepals 5, oblong, ca. 1.2 mm, pilose; petals obovate, 5-6.5 mm, yellow; disk annular; stamens 3; filaments connate at and below middle, free at upper part. Female flowers: pedicel clavate, 1-15 cm; sepals 5, lanceolate, unequal, 5-6 mm, exterior pilose; petals obovate, ca. 12 mm, yellow; ovary glabrous; styles 3, short; stigmas subcapitate. Capsules subglobose, ca. 1.2 cm in diam., glabrous, with 3 longitudinal grooves. Fl. Jan-Sep, fr. May-Nov.

Dense forests, riverside thickets; 400-600 m. Guangdong, S Guangxi, Hainan [Vietnam].