CHIHUAHUAN DESERT:
ELEVATED REGIONS 
At the higher elevations of the Chihuahuan Desert, the
desert grassland community is enriched by
drought-tolerant plants such as sotol (lily family),
century plants (Agave), prickly pears and chollas.  
  
Desert grassland with sotol and a century plant 
This community is replaced, in turn, by a
scrub zone, dominated by evergreen bushes and subtrees,
including small sclerophyllous (thick-leaved) evergreen
oaks with waxy cuticles. 
  
Oak scrub zone 
  
Emory oak (Quercus emoryi) and prickly pear
cactus 
  
Close-up of emory oak (Quercus emoryi) leaves 
  
Grey oak (Quercus grisea) 
  
Shrub live oak (Quercus turbinella) 
  
Three trees in the mountainous region of the Big Bend
Basin: juniper (left), oak (centre), pinyon pine (right) 
  
At still higher elevations, the tree zone is dominated by
Ponderosa pine and Gambel oak  
  
Alligator juniper, so-called because of the
alligator-skin pattern of the bark 
  
Beargrass (Nolina)  
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