Briggs, D. <br/><br/>
Plant variation and evolution / 
D. Briggs, S.M. Walters. 
 - 2nd ed. 
 - Cambridge  :  Cambridge University,  1984. 
 - xv, 412 p. :  ill. ;  24 cm. 
<br/><br/> Includes index. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>0521276659 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Botany--Variation.<br/>Plants--Evolution.