Helsen, Phillippe. <br/><br/>
Galápagos Opuntia (prickly pear) cacti :  Extensive morphological diversity, low genetic variability / 
Phillippe Helsen ... [et al.]. 
 -  Botanical Journal of The Linnean Society of London,  2009. 
 - 451-461 p. 
<br/><br/><br/>Inglés 
<br/><br/><label>ISBN: </label> Normal 
<br/><br/><label>Subjects--Index Terms: </label>Opuntia Prickly pear 
<br/><br/><label>Dewey Class. No.: </label>583.56