Habitat assessment plays a critical role in rare plant conservation.　In environmental impact assessments, developers often need to evaluate importance of vegetation types as rare plant habitats to mitigate the impacts of development projects.　However, information on rare plants is often difficult to obtain owing to rarity or non-disclosure.　A practical approach to link species occurrences and vegetation types therefore is needed for estimating distribution of plants within their habitats.　This study aimed to classify multiple plant habitats and associate them with the phytosociological classification system.　A total of 1129 relevés were classified into 129 plant communities based on a tabular comparison and 29 habitat types based on the occurrence of sixty-nine near-threatened species.　These habitat types clearly correspond to upper units of the phytosociological system and roughly correspond to keywords from literature descriptions of species ecology.　Habitat classification based on phytosociological plant communities is considered effective for plant conservation and impact mitigation.