<i>Isotrema jinquanii</i> (Aristolochiaceae)<i>,</i> a new species from limestone areas of Guangxi, China

Isotrema jinquanii , a new species of Aristolochiaceae from limestone areas in Guangxi, China is described. This new species is most similar to I . sinoburmanicum in the shape of leaf blade and perianth, inflorescence and ovary, but differs by its abaxially densely golden‐tomentose leaf blade, outside densely golden‐villous perianth, slightly cylindric limb and constricted throat. A key to distinguishing I. jinquanii from closely related species is provided.