Description from Flora of China
Stems 1-2 m, glabrous. Leaves opposite; petiole 0.7-1.5 cm; leaf blade narrowly elliptic to ovate or obovate, 5.5-10 X 1.6-3.9 cm, leathery to papery, glabrous, adaxially drying smooth, abaxially few punctate, base cuneate to rounded, margin entire to shallowly crenulate, apex caudate to acuminate; lateral veins indistinct. Cymes axillary, 1-4-flowered; peduncle absent to 0.5(-1) cm; bracts persistent or deciduous, green, lanceolate to narrowly ovate, 6-13 X 2-5 mm. Pedicel 4-10 mm, glabrous. Calyx green, 5-sect from base; segments lanceolate-linear, 7-9 X 1.1-1.5 mm, outside glabrous. Corolla red to orange, ca. 3.5 cm, outside glabrous, inside sparsely glandular puberulent below abaxial lip, without tufts of hairs, mouth oblique; limb indistinctly 2-lipped; adaxial lip erect, ca. 4.5 mm; abaxial lip reflexed, ca. 4.5 mm. Stamens exserted; filaments 1.4-2 cm; anthers coherent in pairs at apex, 1.5-2 mm; staminode ca. 0.6 mm. Pistil ca. 3.5 cm; ovary sparsely glandular puberulent. Style ca. 7 mm, sparsely glandular puberulent. Capsule 7-10 cm. Seeds with 1 hairlike appendage at each end, appendages 1.5-2.5 mm. Fl. Sep-Nov, fr. Oct.
Trees in forests, rocks in river valleys; 900-2800 m. NW and W Yunnan [N Myanmar].