Included here is Honshu, Kyushu, the southwestern part of Hokkaido, the smaller islands of Gotto-retto, Tanega, Tsushima and Yaku, and most of the Korean Peninsula.
Of the endemic and near endemic vascular plants so far recorded there are about 355 species in 290 genera and 94 families. There are 23 endemic genera (marked red) and one endemic family, the Sciadopityaceae (marked green). However, the Cercidiphyllaceae and Eupteleaceae are confined to Eastern Asia.
Hara, H. 1972. Corresponding taxa in North America, Japan, and the Himalayas. In: Taxonomy, Phytogeography and Evolution. Ed. D. H. Valentine. Academic Press.
Kanai, H. 1963. Phytogeographical observations on the Japano-Himalayan Elements. Journal of the Faculty of Science, University of Tokyo, Sect 3. Bot. 8: 305-339.
Numata, M. (ed). 1974. The flora and vegetation of Japan. Elsevier Scientific Publishing Company.
Ohwi, J. 1965. Flora of Japan. Smithsonian Institution. Washington D.C.
Sun, B. & Stuessy, T. F. 1998. Preliminary observations on the evolution of the endemic angiosperms of Ullung Island, Korea. In: Evolution and Speciation of Island Plants. Eds. T. S. Stuessy and M. Ono. Cambridge University Press.