平卧怒江杜鹃

Rhododendron saluenense Franch. var. prostratum (W. W. Smith) R. C. Fang in Act. Bot. Yunn. 4: 256. 1982; 云南植物志 4: 519. 1986; 横断山区维管植物下册 1432. 1994. ——R. prostratum W. W. Smith in Not. Bot. Gard. Edinb. 8: 202. 1914; Curtis's Bot. Mag. 144. t. 8747. 1918; Hutch. in Stevenson, Spec. Rhodod. 596. 1930; Davidian in Rhodod. and Cam. Year Book, 93. 1954; id. Rhodod. Spec. 1: 300. 1982; 中国高等植物图鉴 3: 44. 图4042. 1974. ——R. chameunum Balf. f. et Forrest in Not. Bot. Gard. Edinb. 13: 37. 1920; Hutch in Stevenson, Spec. Rhodod. 591. 1930; Davidian in Rhodod. and Cam. Year Book, 87. 1954; id. Rhodod. Spec. 1: 297. 1982. ——R. cosmetum Balf. f. et Forrest in Not. Bot. Gard. Edinb. 13: 38. 1920; Hutch. in Stevenson, Spec. Rhodod. 593. 1930. ——R. charidotes Balf. f. et Farrer in Not. Bot. Gard. Edinb. 13: 242. 1922; Hutch. in Stevenson, Spec. Rhodod. 592. 1930. ——R. saluenense Franch. subsp. chameunum (Balf. f. et Forrest) Cullen in Not. Bot. Gard. Edinb. 36: 112. 1978; id. in ibid. 39: 117. 1980.

匍匐状矮小灌木，高(5-)10-30(-60)厘米；叶较小，长7-17毫米；花冠较短小，长1.4-2.5厘米；花萼外面无鳞片或偶有数个鳞片，被微毛或近无毛，边缘有短睫毛。其余特征同原变种。

产云南西北部（贡山、德钦、中甸、维西、丽江）。生于岩坡杜鹃灌丛或高山灌丛草甸，海拔(3300-)3800-4800米。模式标本采自丽江。