Aristolochia vallisicola (Aristolochiaceae), a new species from Peninsular Malaysia

A new species in the genus Aristolochia (Aristolochiaceae), A. vallisicola T.L.Yao, from Peninsular Malaysia is described and illustrated. Among all Peninsular Malaysian Aristolochia, it is the only species with a pinnately veined lamina and a disc-liked perianth limb. A distribution map is provided and its conservation status is assessed as Least Concern.