Clausen, Robert Theodore. <br/><br/>
Sedum of the trans-Mexican volcanic belt:   an exposition of taxono mic methods. /  
Drawings by Elfriede Abbe. 
 - London:   Constable,   1959. 
 - x, 380  p. :    illus., maps. ;    24  cm. 
<br/><br/>Includes bibliography : p. [364]-368. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sedum.--------
<br/><br/><label>Dewey Class. No.: </label>583.38 CLA