132. Rhododendron longistylum Rehder & E. H. Wilson in Sargent, Pl. Wilson. 1: 514. 1913.
长柱杜鹃 chang zhu du juan
Shrubs, evergreen, 0.5–2 m tall; branchlets slender, sparsely scaly, usually puberulous. Petiole 2–6 mm, scaly, sometimes also puberulous; leaf blade oblong-obovate, to oblanceolate, 1.6–6 × 0.6–1.5 cm; base tapering; apex acute, mucronate; abaxial surface pale green, scales 2–4 × their own diameter apart, unequal, golden and brown, with broad rims; adaxial surface dark green, sparsely persistently scaly, puberulous along main vein. Inflorescence terminal, (1–)3-flowered. Pedicel 1– 1.5 cm; calyx lobes to 4 mm, triangular, obtuse, persistent in fruit, scaly, slightly puberulous, margin fringed with scales; corolla narrowly funnelform or funnel-campanulate, white, ca. 2 cm, tube ca. 12 mm, outer surface glabrous; stamens 10, filaments pilose at base; style slender, much longer than corolla, not scaly. Capsule broadly cylindric, 5–8 mm, scaly. Fl. Apr–May, fr. Jul–Oct.
Thickets, slopes, cliffs; 1000–2300 m. C Sichuan, NE Yunnan.