Hugh at al,
Those ash you refer to in Colorado National Monument are Singleleaf Ash 
(Fraxinus anomala), a little known native tree of the Southwest that barely 
gets into our area.  The "anomala" comes from its having a single, 
shovelhead-looking leaf, instead of the compound leaves of other ash.  One of 
my favorite trees, to be sure.  Having Black-chinned Sparrows apparently 
becoming part of the CO fauna is exciting for birders, but perhaps the reason 
yet another southwestern species is expanding its range northward isn't. 

Dave Leatherman
Fort Collins

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