长蒴杜鹃 chang shuo du juan

Shrubs or small trees, 3(–12) m tall; bark peeling with a purplish tinge; young shoots slender, glabrous or sparsely setose. Petiole ca. 10 mm, glabrous or sparsely glandular-setose; leaf blade leathery, oblong or oblong-lanceolate, 8–14 × 2.5–4 cm; base cuneate; margin slightly revolute; apex acuminate to obliquely acuminate, uncinate; both surfaces glabrous; midrib prominent abaxially, impressed adaxially; lateral veins 10–15 (–20)-paired, conspicuous on both surfaces, not reaching margin. Inflorescence subapical, mostly 1-flowered; flower bud scales oblong-ovate, gray-white pubescent adaxially. Pedicel 2–2.5 cm, glabrous; calyx undulate, ca. 1 mm, glabrous; corolla narrowly funnel-campanulate, pink or white, with yellowish orange markings on inner surface of upper lobes, 5–5.7 × ca. 5 cm, tube narrowed towards base, ca. 25 mm, both surfaces glabrous; stamens (9 or)10, unequal, included, filaments subglabrous at base; ovary cylindric, truncate at junction with style, ca. 7 mm, black when dried, glabrous; style ca. 4 cm, equaling or shorter than corolla, glabrous. Capsule cylindric, apex truncate, up to 60 × ca. 4 mm; style persistent. Fl. Apr–May, fr. Nov.

Thickets; 2000–2800 m. SE Xizang, W Yunnan [NE Myanmar].