Premna hainanensis Chun & F. C. How

Allied to Premna serratifolia but differs in having papery to subleathery leaf blades, lateral veins adaxially obscure, and calyces with lower lip subentire to slightly 2-dentate.

Shrubs 1-3 m tall, erect to climbing. Branchlets and inflorescences mealy when young, subglabrescent. Branchlets brown striate, conspicuously lenticellate. Petiole 0.8-1.2 cm; leaf blade dark green when dry, elliptic to ovate-elliptic, 4-9 2-4.5 cm, papery to subleathery, shiny, glabrous or pubescent along veins, midvein abaxially raised and adaxially impressed, base broadly cuneate to subrounded, margin entire, apex acuminate to obtuse; veins 5 or 6 pairs, curve apically along margins and anastomose. Inflorescences 2-5 cm across; peduncle 0.5-1.5 mm; bracts awl-shaped, ca. 1.5 mm. Calyx 1.8-2 mm, puberulent to subglabrous. Corolla yellow or white, outside puberulent, white villous in throat, slightly 2-lipped, tube 3-4 mm, lower lip 3-lobed with middle lobe longer than laterals, upper lip emarginate. Stamens exserted. Ovary subrounded, glabrous. Style ca. 3 mm. Fruiting calyx 2-lipped to subtruncate, lower lip subentire to slightly 2-dentate, upper lip 2-dentate. Fruit green when young, becoming brown, obovate, 2-3 mm in diam. Fl. and fr. Sep-Nov.

Hainan

* Thickets on mountain slopes; 200-400 m.