Traditionally, the genus Aristolochia L. sensu lato is the largest genus in the family Aristolochiaceae. According to recent morphological and phylogenetic studies, Aristolochia subgen. Siphisia has been reintroduced as a separate genus Isotrema.
During a botanical exploration, researchers from the Xishuangbanna Tropical Botanical Garden of the Chinese Academy of Sciences collected an unknown species of Isotrema in the Menglai Grand Canyon, Cangyuan County, Yunnan Province. After careful morphological examination and literature review, they confirmed that it was aThe new species was named as Isotrema cangyuanense to indicate its type locality, Cangyuan County and was published inIsotrema cangyuanense is a perennial, woody liana.
The new species is also similar to I. moupinense, but easily distinguished by its both surfaces of the leaf blade densely villous; the utricle is shorter; the inner surface of the tube brownish, with dense dark reddish-brown papillae in the upper part; the throat is brownish, with dense dark reddish-brown papillae, etc.
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