<p>Short columnar cactus densely covered with long spines.</p>
<p>The spines of juvenile saguaro cacti are denser than those of mature plants. Saguaro National Park (Rincon Mountain District), Arizona.</p>
<ul><li>Keywords: arizona; rincon mountain district; saguaro national park; saguaro cactus</li></ul>
Alice Wondrak-Biel
Taken on 22 October 2011
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