Included here are the extensive grassy plains east of the Rocky Mountains. Its boundary extends north to the coniferous forests of Alberta, Saskatchewan and Manitoba, east to the deciduous forests of the Appalachians and south and southwest to the Sonoran desert.
Of the endemic or near endemic vascular plants so far recorded there are about 34 species in 20 genera and 10 families. There is 1 endemic or near endemic genus (marked red) but no endemic families.
Hazlett, D. L. 2004. Vascular plant species of the Comanche National Grassland in southeastern Colorado. United States Department of Agriculture.
McKell, C. M. & Garcia-Moya, E. 1989. North American Shrublands. In: The Biology and Utilization of Shrubs. Ed. C. M. McKell. Academic Press, Inc.
Moss, E. H. 1971. The parkland or grove belt of Alberta. In: World Vegetation Types. Ed. S. R. Eyre. Macmillan.
Qian, H. 1999. Floristic analysis of vascular plant genera of North America north of Mexico: characterization and phytogeography. Journal of Biogeography, 26: 1307-1321.
Ricketts, T. h. et al. 1999. Terrestrial Ecosystems of North America - a conservation assessment. World Wildlife Fund, USA and Canada. Island Press, Washington.
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Vanderhorst, J., Cooper, S. V. & Heidel, B. L. 1998. Botanical and vegetation survey of Carter County, Montana. United States Department of the Interior Bureau of Land Management.Watt, F. B. 1969. The Natural Vegetation of the Southern Great Plains of Canada. In: Vegetation, Soils and Wildlife. Eds. J. G. Nelson & M. J. Chambers. Methuen.