. The geography of Texas, physical and political. d plantgrowth. That this peculiar condition may be furtheremphasized, attention is now called to the so-called LifeZones. Based upon the distribution of plants and animals, andwith boundaries somewhat indefinite, North America hasbeen divided into three great transcontinental regions,or belts, namely: 1. Boreal, or Northern. 2. Austral, or Southern. 3. Tropical. Although the Boreal region is prolonged southwardalong the higher ranges of the Rocky mountains, it is notrepresented in Texas. VEGETATION 61 Of the Austral region the following zones a
. The geography of Texas, physical and political. d plantgrowth. That this peculiar condition may be furtheremphasized, attention is now called to the so-called LifeZones. Based upon the distribution of plants and animals, andwith boundaries somewhat indefinite, North America hasbeen divided into three great transcontinental regions,or belts, namely: 1. Boreal, or Northern. 2. Austral, or Southern. 3. Tropical. Although the Boreal region is prolonged southwardalong the higher ranges of the Rocky mountains, it is notrepresented in Texas. VEGETATION 61 Of the Austral region the following zones are recognized : a. Transition, which enters the state in the region of theGuadalupe mountains and is characterized by a Rockymountain vegetation, especially the pine forests. b. Upper Sonoran, which includes the Panhandle countrynorth of the Canadian river and the Llano Estacado, witha vegetation characteristic of the Great plains at the base TransitionUpper Sonoran Lo-xver Sonoran Humid Division ofLower SonoranSemi-Tropicalor Gulf StripTropical. TEXAS Showing the Life Zones Scale Fig. 37, Map of Texas showing the Life Zoxes of the Rocky mountains. It is also represented in theTrans-Pecos by a series of isolated mountain summitsrising out of the Lower Sonoran zone (Bray). c. Lower Sonoran, which includes the western part of theCentral basin, the Edwards and Stockton plateaus, the RioPecos valley, and the Rio Grande valley and plain withthe exception of a small area near the mouth of the river. 62 THE GEOGRAPHY OF TEXAS The plants of the Central basin have a close relationshipwith those of the prairies to the north, whereas the plantsof the Rio Grande plain have a close relationship withthose of the Tropical region to the south. d. Austroriparian or Humid Division of the Lower Sonoranembraces eastern Texas exclusive of the Coastal are found the Forested area or the southwesternextension of the Atlantic Timber belt, the Black andGrand prairies, the Cross Timbers, and,
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