Vascular plant systematics / 
by Albert E. Radford ... [et al.] with contributions by Ben W. Smith ... [et al.]; ill. except appendix by Marion S. Seiler. 
 - New York :  Harper & Row,  1974. 
 - 891 p. :  ill. ;  29 cm. 
<br/><br/><label>ISBN: </label>0060453087 0060453095  pbk 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Botany--Classification.