Description from Flora of China
Shrubs, scandent. Branches light to dark brown. Petiole 5-8 mm, glabrous; leaf blade narrowly lanceolate, 5-10 X 1-2.5 cm, glabrescent, adaxially black when dry, base cuneate, margin entire, apex narrowly acuminate. Racemes borne on main stem, 5-6 cm; bracts petiolate, small, herbaceous, deciduous after flowering. Pedicels and calyces glabrous. Flowers paired at nodes. Pedicel 5-8 mm. Bracteoles petiolate, lanceolate, inserted at pedicel apex. Calyx campanulate, 5-6 mm; lobes 5, triangular, apex acute. Corolla bright red. Capsule ovoid, glabrous, apex acute. Fl. Jun-Jul, fr. autumn.
* Forests in low mountains. SW Guangxi.