Included here is the island of Sumatra together with its surrounding islands such as Nias, Siberut, Bangka and Belitung.
Of the endemic vascular plants so far recorded there are about 256 species in 120 genera and 62 families. There are 4 endemic genera (marked red) but no endemic families. However, this list is likely to be incomplete since there are reported to be 17 endemic genera so further information is required.
Campbell, D. G. & Hammond, H. D. 1989. Floristic Inventory of Tropical Countries. The New York Botanical Garden.
Whitten, T., Damanik, S. J., Anwar, J. & Hisyam, N. 2000. The Ecology of Sumatra. Periplus.