Description from Flora of China
Pieris macrocalyx J. Anthony, Notes Roy. Bot. Gard. Edinburgh 15: 241. 1927.
Shrubs or small trees, semievergreen to deciduous, 1–2(–4) m tall. Twigs puberulous, glabrescent. Buds flattened-ovoid, 7–9 mm, glabrous. Petiole 2–10 mm, pubescent; leaf blade ovate or elliptic, 4–10 × 2.5–5 cm, leathery, abaxially with short dense fulvous hairs, adaxially glabrous, veins raised abaxially, impressed adaxially, base obtuse-rounded to broadly cuneate or shallowly cordate, apex acuminate or obtuse-rounded. Inflorescences 2–7 cm, glabrous; bracts leaflike. Pedicel 5–10 mm, pubescent. Calyx 5(–8)-lobed; lobes broadly ovate, 6–11 mm, leathery, abaxially with sparse or dense fulvous hairs or subglabrous. Corolla urceolate, 6–10 mm, abaxially sparsely fulvous-pubescent; lobes 1–2 mm. Filaments 5–6 mm, pilose, without spurs. Ovary glabrous. Capsule globose, 5–7 mm in diam., with thick sutures, glabrous. Fl. Jul–Aug, fr. Aug–Sep.
Abies forests, cliffs in rain forests, forest margins, thickets; 1800–3500 m. SE Xizang, NW Yunnan [Myanmar].