Astrophytum myriostigma
<a href="http://www.flickr.com/photos/12932436@N03/2530636999/" title="Astrophytum myriostigma - 01 by jsasvari, on Flickr"><img src="http://farm4.static.flickr.com/3205/2530636999_93723ba3d3.jpg" width="500" height="375" alt="Astrophytum myriostigma - 01" /></a>