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Texas is 860 miles north to south and 773 miles east to west and contains 267,339 square miles with a 624 mile coastline. Almost 100 peaks in the Trans-Pecos area are over one mile high. About 56 inches of rain fall in the eastern part of the state, around 30 inches in the central areas, and less than 8 inches in the Chihuahuan Desert in the extreme west. There are almost 5,000 species of vascular plants in our state (Correll and Johnston, 1979).
Texas has ten distinct vegetational areas. They are:
2. Gulf Prairies and Marshes
3. Post Oak Savanna
4. Blackland Prairies
5. Cross Timbers and Prairies
6. South Texas Plains
7. Edwards Plateau
8. Rolling Plains
9. High Plains
The information for the various Vegetation Areas of Texas is compiled mostly from Preserving Texas’ Natural Heritage, a report by the Natural Heritage Policy Research Project, Lyndon B. Johnson School of Public Affairs, Policy Research Project Report Number 31, 1978, and from Manual of the Vascular Plants of Texas by Donovan Stewart Correll and Marshall Conring Johnston; published by The University of Texas at Dallas, Box 688, Richardson, Texas 75080, 1979.