中文摘要：

报道了中国贵州杜鹃属一新种——百纳杜鹃（RhododendronbainaenseXiangChen＆ChengH．Yang）。百纳杜鹃与红棕杜鹃（R．rubiginosumFranch．）相似，但本种的叶为长圆形至卵形，叶背鳞片大小近似、琥珀色、凹陷，花冠较小、白色带浅粉色且不具斑点，花丝基部近无毛或仅部分被微柔毛，花药淡褐色。目前该新种的资源量十分稀少，野外调查仅发现1个种群含3株，应该给予重点保护。

英文摘要：

One new species, Rhododendron bainaense Xiang Chen ＆ Cheng H. Yang from Guizhou Province, China is described and illustrated. Rhododendron bainaense is most similar to R. rubiginosum from which it differs mainly by having oblong to ovate leaf blades, subequal, amber and concave scales on leaf blades abaxial surfaces, a 2.5 cm long, pale pinkish white and spotless corolla, and nearly glabrous or partly puberulent filaments, and pale brown anthers. The new species is Critically endangered （CR）, based on the IUCN Red List Categories and Criteria, since there is only one population that includes 3 mature individuals found so far during the field work, therefore, careful protection is highly desired.