Lava cactus, <i>Brachycereus nesioticus</i>, on right
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/59503392@N00">paul peracchia</a>
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/59503392@N00/372714558/">cac-tie</a>