【Objective】Wild citrus plants are growing in the Nankun mountain, Longmen county, Guangdong Province, which is named ‘Longmeng Xiangcheng' by the locals. This study aimed to reveal the genetic differences between ‘Longmeng Xiangcheng' and other citrus species by using morphological and molecular analysis. 【Method】The habitat environment of ‘Longmen xiangcheng' was investigated, and the morphology of leaf, flower and fruit was described. Fruit were analyzed for content of total soluble solid, sugar, titratab...