中国贵州杜鹃属两新种

Two New Species of Rhododendron (Ericaceae) from Guizhou, China

摘要:

报道了中国贵州杜鹃属植物2新种——枇杷叶杜鹃(Rhododendron eriobotryoides Xiang Chen & Jia Y. Huang)和金波杜鹃(R. jinboense Xiang Chen & X. Chen)。枇杷叶杜鹃与皱叶杜鹃(R. denudatum)相似，但本种叶背毛被较薄而稀疏，花丝基部密被微柔毛，花柱通体被腺体。金波杜鹃与短脉杜鹃(R. brevinerve)相似，但前者的叶长圆状椭圆形，叶片上卷呈U形，花序具较多花，花冠较长，花丝基部密被微柔毛，子房密被绒毛。目前，仅发现2新种各有1个含数株的种群，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。

Abstract:

Two new species, Rhododendron eriobotryoides Xiang Chen & Jia Y. Huang and R. jinboense Xiang Chen & X. Chen (Ericaceae), from Guizhou Province, China are described and illustrated. Rhododendron eriobotryoides is close to R. denudatum from which it differs by having thinner and sparser flocculence on the leaf blade abaxial surface, puberulent filaments, and a glandular style. Rhododendron jinboense differs from the most morphologically similar species R. brevinerve by the former’s oblong-elliptic and U-shaped leaf blades, a more floriferous inflorescence, a longer corolla, puberulent filaments, and a densely tomentose ovary. Both of the new species are Critically endangered, (CR), based on the IUCN Red List Categories and Criteria, therefore, careful protection is highly desired.