<i><a href="//commons.wikimedia.org/wiki/Carnegiea_gigantea" title="Carnegiea gigantea">Carnegiea gigantea</a></i> flower, Saguaro National Park, west of Tucson, Arizona. Most of the flowers are on the tops of 7-10 m high cactus; this one was on a bent arm hanging low to the ground.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/10271343@N00">Ken Bosma</a> from Tucson, Arizona, USA
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/kretyen/7184410152/">Saguaro cactus bloom</a>