BRIGGS, D. <br/><br/>
Plant Variation and Evolution. 

 - 2nd edi. 
 - Cambridge.  Cambridge University Press.  1969 
 - xv, 412p. 
<br/><br/><label>ISBN: </label>0 521 25706 9 
<br/><br/><label>Dewey Class. No.: </label>581.158'