Comparative Summary of the Regions

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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