Description from Flora of China
Vaccinium serpens Wight, Calcutta J. Nat. Hist. 8: 171. 1847; Pentapterygium serpens (Wight) Klotzsch; Thibaudia myrtifolia Griffith.
Shrubs 40–60 cm tall. Rootstock tuberous. Twigs terete, 1–2 mm in diam., densely spreading glandular setose. Leaves crowded; petiole ca. 1 mm, glabrous; leaf blade pale green abaxially, deep green adaxially, narrowly ovate or ovate-oblong, 1.2–2 cm × 5–8 mm, leathery, abaxially smooth, adaxially drying transversely rugose, glabrous, secondary veins ca. 3 pairs, usually inconspicuous, base rounded, margin slightly recurved, serrate above middle, apex acute or obtuse, distinctly mucronulate. Inflorescences fasciculate, 1–3-flowered. Pedicel erect or pendulous, 0.7–2.5 cm, densely spreading glandular setose, slightly thicker at apex. Calyx tube 3.5–4 mm, 5-winged, along wings sparsely glandular setose; limb divided nearly to base; lobes ovate-triangular, 3.5–4.5 mm, glandular ciliate, apex acute or subobtuse. Corolla bright red, orange, or pinkish white, with dark red zig-zag bands, tubular, 1.2–2.8 cm, 5-angled, sparsely glandular; lobes recurved, triangular, 2–3(–6) mm. Filaments ca. 3 mm, glabrous; anthers ca. 1.9 cm, thecae papillate, base apiculate, tubules to 2 × as long as thecae, without spurs. Berry obovoid, 5-winged, ca. 6 mm in diam.; persistent calyx lobes enlarged. Fl. May–Jun, fr. May–Nov.
Evergreen forests, epiphytic on mossy tree trunks, rocks; 1200–2400 m. S Xizang (Dinggyê, Nyalam) [Bhutan, NE India (Darjiling), E Nepal, Sikkim].