Description from Flora of China
Shrubs evergreen, small, 1.5-2 m tall, glabrous or sometimes slightly puberulent on inflorescences. Flowering branchlets yellow-green, striate, elongate, slender; fruiting branchlets dark brown. Petiole slender, 1-1.5 cm, narrowly sulcate adaxially; leaf blade narrowly lanceolate, 5-11 × 1.2-2 cm; thinly leathery, both surfaces glabrous, midvein impressed adaxially, secondary veins in 6-8 pairs, arcuate ascending, reticulate veins prominent, dense, base subacute or cuneate, margin revolute when dry, 4-8-crenate-dentate on both sides proximally, entire distally, apex acuminate or long acuminate. Racemes terminal or axillary, solitary or 2- or 3-clustered, erect, 7-18 cm or more; rachis striate, puberulous; bracts subulate, ca. 1 mm, deciduous. Flowers numerous; pedicel erect or erect-spreading, 4-5 mm, puberulous. Calyx shallowly cupular; lobes narrowly lanceolate, ca. 2 mm, puberulous. Petals reflexed at anthesis, white, oblong-lanceolate, ca. 4-5 × ca. 2 mm, puberulous. Stamens shorter than petals, ca. 4 mm; filaments glabrous; anthers oblong. Ovary semi-inferior, glabrous. Stigma capitate. Capsule suboblong-conical, 8-10 mm, glabrous. Fl. Jun, fr. Jul-Nov.
This species is easily distinguished from other native species in having leaf blades narrowly lanceolate, sparsely glandular dentate distally, acuminate apically, and petals reflexed at anthesis.
* Streamsides on mountain slopes, shaded places in valleys; 100-800 m. ?Guangdong, S Guangxi.