【摘要】 报道了贵州百里杜鹃自然保护区杜鹃属植物一新种小白杜鹃Rhododendron maculatum Xiang Chen & Jiayong Huang和马缨杜鹃一新变种微毛马缨杜鹃Rhododendron delavayi var.puberulum Xiang Chen & Xun Chen。小白杜鹃R.maculatum与疣梗杜鹃R.verruciferum较为相似,但区别于前者的幼枝和叶柄幼时被腺体,叶较大而背面无毛,花序轴较长且疏被腺体,花梗仅密被腺体而无疣点,花冠白色,较大,通常宽钟形,具紫红色大斑块,花丝、子房和花柱均较长。微毛马缨杜鹃R.delavayi var.puberulum与原变种马缨杜鹃R.delavayi var.delavayi的区别在于叶狭长,背面毛被稍薄而紧贴,花冠管内外、花丝和花柱均被微柔毛。目前,该新种和新变种仅发现3个种群含数株,资源量十分稀少,依据IUCN红色名录标准均属于极危物种(CR),需要加以重点保护。更多还原

【Abstract】 A new species,Rhododendron maculatum Xiang Chen & Jiayong Huang,and a new variety,Rhododendron delavayi Franchet var.puberulum Xiang Chen & Xun Chen(Ericaceae),from Guizhou Province,China are described and illustrated.R.maculatum is close to R.verruciferum from which it differs by having glandular branchlets and petioles,a bigger leaf blade with glabrous abaxial surface,a longer sparsely glandular rachis,a not warty but desenly glandular pedicel,a bigger widely campanulate white corolla with a purplish red blotch,and a longer filament,ovary,and style.R.delavayi var.puberulum differs from R.delavayi var.delavayi by the former’s oblanceolate leaf blades with somewhat thin and compact indumentum on abaxial surface,puberulent corolla tube,filaments,and style.Both of the new species and new variety are Critically endangered(CR),based on the IUCN Red List Categories and Criteria,therefore,careful protection is highly desired.更多还原