A new species in the genus Aristolochia (Aristolochiaceae), Aristolochia vallisicola T.L.Yao, from Peninsular Malaysia is described and illustrated. Among all Peninsular Malaysian Aristolochia,itis 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.
Keywords: Aristolochia; Aristolochiaceae; Peninsular Malaysia.