Flora of the canga of the Serra dos Carajás, Pará, Brazil: Aristolochiaceae

Abstract We present the floristic treatment for the species of Aristolochiaceae from the canga of the Serra dos Carajás, state of Pará, Brazil. One genus and three species are recorded: Aristolochia mossii with Amazonian and periamazonic distribution, A. rugosa with distribution in the Cerrado and Amazonia, and Aristolochia aff. disticha with uncertain identification. An identification key, descriptions, illustrations, photos, and comments are also provided.