Just a half hour drive from downtown Tucson a wilderness awaits in the Rincon Mountains of Saguaro National Park on the Tanque Verde Ridge Trail. 
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Petey and Ms. Mesquitey ramble a favorite dirt road through a sky island in southeastern Arizona stopping to admire the flora every few minutes...
I had a chance to use the word didymus when describing the seed pods of Menodora, but forgot, so here: the common name twinberry...
The concept of the mountain ranges of the southwest as sky islands goes back to at least 1943 when Natt N. Dodge wrote that...
