Briggs, D walters SM <br/><br/>
Plant variation and evolution 

 - 2nd ed. 
 - Cambridge  Cambridge University Press  1984 
 - xv,412 p. 
<br/><br/><label>ISBN: </label> PON9.95 
<br/><br/><label>Dewey Class. No.: </label>581.15 B768P