In order to exactly identify the distribution status of herbal medical plants on Jeju Island, we are conducting a distribution survey on the Island, focusing on specific plants listed in the KP and KHP rather than a study of local flora. In this study, we first report on three species that we believe need to be reconsidered in their distribution and taxonomic characteristics. Magnolia kobus is found to be more distributed in surrounding Oreum than Mt. Halla. The scientific name “Astragalus membranaceus” listed in the KP and KHP should be corrected to “Astragalus mongholicus”. In Jeju Island, Pulsatilla koreana is not distributed, and all of their individuals are P. cernua. Our study is expected to be used as an important source of data to understand the distribution of herbal medical plants on the Korean Peninsula to prepare potential preparedness for Nagoya Protocol requirements.