This study explores the similarities and differences in the ethnobotanical knowledge of edible plants among the North Paiwan people (Tjavatjavang and Tukuvulj communities) and West Rukai people (Labuwan, Kinulane, and Adiri communities) in Pingtung by using knowedge structures represented by conceptual graphs. This study aims to understand how the North Paiwan and West Rukai influence each other's ethnobotanical uses of plants, cultures and even languages. This study creates conceptual graphs of the ethnobotanical knowledge of 9 edible plants commonly used by the North Paiwan and West Rukai. Our findings suggest that it becomes gradually difficult to distinguish between North Paiwan's and West Rukai's ethnobotanical uses of edible plants and their indigenous names. Nevertheless, the economic uses of edible plants vary according to the locations of indigenous communities. This study hopes to contribute to the conservation and sustainable development of indigenous peoples' traditional ecological knowledge.