Homage to Arizona: 3

Arizona cactus-1

(Charles Platt is a guest blogger)

I found these looping cacti in the botanical gardens in Phoenix, where exotic species display the most amazing attributes, all of which they developed to survive and compete in a very hostile climate. Arizona vegetation is tough and extremely well defended (as anyone knows who has brushed carelessly against a prickly-pear cactus). I admire those traits.