Isotrema cangshanense X.X.Zhu, H.L.Zheng & J.S.Ma, a new species from western Yunnan, China, is described and illustrated here. It is similar to I. utriforme, I. forrestianum, I. cucurbitoides and I. obliquum The major differences between them are outlined and discussed. A detailed description, along with line drawings, photographs, habitat and distribution, as well as a comparison to morphologically similar species, is also provided. Meanwhile, the new taxon is assessed as Vulnerable (VU D2), according to the IUCN Red List criteria.
Keywords: Aristolochia; Isotrema; morphology; subgenus Siphisia; taxonomy.
Xin Xin Zhu, Hai Lei Zheng, Jun Wang, Yong Qian Gao, Jin Shuang Ma.