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Table 2. Summary of the physical and climatic characteristics of the vegetation areas of Texas. (Adapted from Godfrey et al. 1973.)
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____Size_____ Month of Peak
Million Acres Annual Precipitation
(Million Precipitation Frost Free Elevation (secondary
Hectares) in Inches Days Topography in Feet Major Soil Orders peak)
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1. Pineywoods 15.80 40-56 235-265 Nearly level to 200-700 Ultisols, Alfisols Even
(6.4) gently undulating distribution
2. Gulf Prairies & 10.0 26-56 245-320 Nearly level 0-250 Vertisols, Entisols September
Marshes (4.1) (May)
3. Post Oak Savannah 6.85 30-45 235-280 Nearly level to 300-800 Alfisols, Vertisols, May
(2.8) gently rolling Ultisols (September)
4. Blackland Prairies 12.6 30-45 230-280 Nearly level to 250-700 Vertisols, Alfisols May
(5.1) rolling (September)
5. Cross Timbers & 15.3 25-35 230-280 Gently rolling 500-1500 Mollisols, Alfisols May
Prairies (6.2) (September)
6. South Texas Plains 20.9 18-30 260-340 Nearly level to 0-1000 Mollisols, Vertisols September
(8.5) rolling Alfisols, Entisols (May)
7. Edwards Plateau 25.45 12-32 220-260 Deeply dissected 1200-3000 Entisols, Mollisols, May
(10.3) hilly, stony Alfisols (September)
plain
8. Rolling Plains 24.0 18-28 185-235 Nearly level to 1000-3000 Mainly Mollisols, May
(9.7) rolling Secondarily Alfisols (September)
9. High Plains 19.4 14-21 180-220 Nearly level 3000-4500 Alfisols, Mollisols May
(7.9) high plateau (September)
10. Trans-Pecos 17.95 8-18 220-245 Mountain ranges 2500-8751 Aridisols, Entisols July, August
(7.3) rough, rocky Mollisols September
land, flat (November)
basins and plateaus
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