《中国植物志》|| 杜鹃花科 ERICACEAE ||钟花杜鹃亚组 Subsect. Campanulata Sleumer ||簇毛杜鹃 Rhododendron wallichii Hook.f.

194.簇毛杜鹃（中国高等植物图鉴）图版82：6-10
Rhododendron wallichii Hook. f. , Rhodod. Sikkim Himal. , 4: t. 5. 18491; Tagg in Stevenson, Spec. Rhodod 181. 1930; Cowan in Not. Bot. Gard. Edinb. 19: 233. 1937; Cowan. et Davidian in Rhodod. Year-book 4: 174. 1949; 中国高等植物图鉴3: 135, 图4223. 1974; Cullen et Chamb. in Not. Bot. Gard. Edinb. 37: 329. 1979; Chamb. in Not. Bot. Gard. Edinb. 39: 373. 1982; 西藏植物志3: 614, 图244: 1-6. 1986. ——R. campanulatum D. Don var. wallichii Hook. f. in Curtis's Bot. Mag. 82: t. 4928. 1856.
常绿灌木，高2-4米；幼枝无毛或稍被微柔毛，直径约5毫米。叶革质，椭圆形或长圆形或倒卵形，长7-12厘米，宽2.5-5厘米，先端圆或钝，具短凸尖头，基部圆形或心形，边缘略反卷，上面暗绿色，无毛，中脉凹入，侧脉10-13对，微凹，下面被颗粒状的棕色至锈色簇毛，不形成连续的毛被，并多少能脱落，中脉凸起，侧脉略凸；叶柄长1-1.5厘米，常带红色，上面具槽，下面圆形，无毛或被绒毛。顶生总状伞形花序，有花5-10朵，总轴长约2厘米，无毛或略被毛；花梗长1-2.5厘米，略被丛卷毛或近于无毛；花萼小，长0.5-2毫米，裂片5，三角形或圆形，疏被绒毛或无毛；花冠宽钟形，长3.5-5厘米，丁香紫色至淡紫红色或白色，多少具深蔷薇色斑点，裂片5，圆形，长约1.5厘米，宽2厘米，顶端微缺；雄蕊10，不等长，长2-3.5厘米，花丝白色，基部被微柔毛，花药椭圆形，紫褐色，长2毫米；子房狭长圆柱形，长5-7毫米，无毛或略被微柔毛，5-6室，花柱淡白色，无毛，柱头浅裂。蒴果长圆柱形，长1.5-3厘米，直径5-7毫米，略弯，无毛。花期5-6月，果期7-9月。
产我国西藏南部。生于海拔3 000-4 300米的混交林或灌丛中。尼泊尔东部、不丹、锡金、印度北部也有分布。模式标本采自锡金。

《Flora of China》|| Apiaceae || Rhododendron ||簇毛杜鹃 Rhododendron wallichii

403. Rhododendron wallichii J. D. Hooker, Rhododendr. Sikkim-Himalaya. 1: t. 5. 1849.

簇毛杜鹃 cu mao du juan

Rhododendron campanulatum D. Don var. wallichii (J. D. Hooker) Hooker; R. heftii Davidian.

Shrubs 2–4 m tall; young shoots ca. 5 mm in diam., glabrous or floccose. Petiole often reddish, 10–15 mm, glabrous or sometimes tomentose; leaf blade leathery, elliptic to oblong- obovate, 7–12 × 2.5–5 cm; base rounded or cordate; margin slightly revolute; apex obtuse or rounded, mucronate; abaxial surface glabrous or brown to ferruginous, indumentum granular, discontinuous, ± detersile, hairs fasciculate. Inflorescence racemose-umbellate, 5–8-flowered; rachis ca. 20 mm, hairy or glabrous. Pedicel 0.1–0.25 cm, glabrous or floccose; calyx lobes 0.5–2 mm, rounded or triangular, glabrous or floccose; corolla broadly campanulate, lilac-purple, purplish red or whitish, ± deeply rose-spotted, 3.5–5 cm, lobes 5; stamens 10, unequal; filaments pubescent at base; ovary 5–7 mm, 5–6-locular, glabrous, rarely with a few pubescent hairs; style glabrous; stigma lobed. Capsule slightly curved, 15–30 × 5–7 mm, glabrous. Fl. May–Jun, fr. Jul–Sep.

Mixed forests, mountain slopes; 3000–4300 m. S Xizang [Bhutan, NE India (Darjiling), E Nepal, Sikkim].