Included here are the Ryukyu Archipelago situated between Kyushu and Taiwan, and comprising Okinawa, Ishigaki, Iriomote, Tokuno-Shima, and the Amami and Tokara islands. There are more than 60 islands the largest of which is Okinawa.
Of the endemic vascular plants so far recorded there are about 25 species in 22 genera and 18 families. There is one endemic genus (marked red) but no endemic families.
Numata, M. (ed). 1974. The flora and vegetation of Japan. Elsevier Scientific Publishing Company.