﻿AbstractStruthanthusibe-dzisp. nov.is a new species described and illustrated from the cloud and pine-oak forests of the Sierra Madre del Sur in Oaxaca, Mexico. This species shares similarities of leaf shape and inflorescence type withS.deppeanus,S.quercicola, andS.ramiro-cruzii. However,S.ibe-dzican be recognized by its glaucous branches, leaves and inflorescences; compressed nodes; convoluted distal half of styles in pistillate flowers; and staminate flowers with asymmetrical thecae and an extended connective forming an apiculate horn in both anther series. A distribution map and an identification key are provided to separateS.ibe-dzifrom morphologically similar congeners present in the region.