A floristic study on the vascular plants from Mt. Seounsan region, which ranges from Seoun-myeon, Anseong-si, Gyeonggi-do to Baekgok-myeon, Jincheon-gun, Chungcheongbuk-do, was conducted 9 times in total, from April 2014 to October 2015. Based on the voucher specimens, it was revealed that the vascular plants in this region comprised 501 taxa: 97 families, 306 genera, 439 species, 5 subspecies, 51 varieties, and 6 forma. Among these plants, 185 taxa were recorded for the first time from this region. 8 Korean endemic species including Asarum patens (K.Yamaki) B.U.Oh, Scutellaria insignis Nakai, and Weigela subsessilis (Nakai) L.H.Bailey were found in this region. 5 taxa of rare plants designated by the Korea Forest Service, including Iris ruthenica KerGawl., Leontopodium leontopodioides (Willd.) Beauverd, and Tricyrtis macropoda Miq., were also found. 11 taxa of floristic regional indicator plants in the 3rd to the 5th degrees were identified. In addition, 46 taxa of naturalized plants were recorded, and 2 taxa of ecosystem disturbance plants, which were Ambrosia trifida L. and Aster pilosus Willd., also found.

• 장현도(국립생물자원관 식물자원과) | Hyun-Do Jang (Plant Resources Division, National Institute of Biological Resources)
• 심선희(국립생물자원관 식물자원과) | Sunhee Sim (Plant Resources Division, National Institute of Biological Resources)
• 오아미(충북대학교 생물학과) | Ami Oh (Department of Biology, Chungbuk National university)
• 오병운(충북대학교 생물학과) | Byoung-Un Oh (Department of Biology, Chungbuk National university) Corresponding author
• 임효선(국립생태원 생태평가연구실) | Hyosun Leem (Division of Ecological Assessment, National Institute of Ecology)
• 한세희(국립농업과학원 농업유전자원센터) | Seahee Han (National Agrobiodiversity Center, National Academy of Agricultural Science)
• 양선규(한국한의학연구원 K-herb 연구단) | Sun-Gyu Yang (K-herb Research Center, Korea Institute of Oriental Medicine)