Description from Flora of China
Stems ca. 1 m, glabrous. Leaves opposite; petiole 5-10 mm; leaf blade nearly linear to narrowly oblanceolate or narrowly elliptic, (5-)17-23 X 0.8-2(-3) cm, leathery to thick leathery, glabrous, adaxially drying wrinkled, abaxially not punctate, base attenuate, margin entire, apex acuminate to narrowly acuminate; lateral veins invisible. Cymes pseudoterminal, 1-14-flowered; peduncle absent; bracts persistent, green tinged purple, lanceolate, ca. 5 X 2 mm. Pedicel 3-6 mm, puberulent. Calyx green tinged purple, ca. 5 mm, 5-lobed from above middle; tube ca. 4.5 mm in diam. at mouth; lobes triangular, 1-2 X ca. 1.6 mm, outside sparsely puberulent. Corolla red, 2.4-3.4 cm, outside puberulent, inside very sparsely puberulent, without tufts of hairs, mouth slightly oblique; limb indistinctly 2-lipped, lips nearly equal, ca. 5 mm. Stamens exserted; filaments 1.5-2 cm; anthers coherent in pairs at apex, 1-1.5 mm; staminode ca. 1.1 mm. Pistil ca. 2.5 cm; ovary glabrous. Style ca. 8 mm, glandular puberulent. Capsule 20-30 cm. Seeds with 2 hairlike appendages at hilar end, appendages ca. 3 cm, opposite end with 1 hairlike appendage ca. 3.5 cm. Fl. May-Jun, fr. Jul-Nov.
* On trees in broad-leaved forests; 1700-2300 m. Yunnan (Gongshan Xian, Tengchong Xian).