Included here is the island of Guam located in the western Pacific. It is the southernmost and largest of the Mariana Islands and is also the largest island in Micronesia.
Of the endemic vascular plants so far recorded there are about 11 species in 10 genera and 9 families but no endemic genera. This list has recently been revised by Costion & Lorence (2012).
Costion, C. M. & Lorence, D. H. 2012. The Endemic Plants of Micronesia: A Geographical Checklist and Commentary. Micronesica, 43: 51-100.
Fosberg, F. R., Sachet, M. H. & Oliver, R. 1979. A Geographical Checklist of the Micronesian Dicotyledonae. Micronesica, 15: 41-295.
Fosberg, F. R. 1984. Phytogeographic comparison of Polynesia and Micronesia. In: Biogeography of the Tropical Pacific (Proceedings of a Symposium). Eds. F. J. Radovsky, P. H. Raven and H. Sohmer. Bishop Museum Special Publication No. 72.
Stone, B. C. 1970-71. The Flora of Guam. Micronesica, 6: 1-659.