Walters, Dirk R. <br/><br/>
Vascular plant taxonomy / 
Dirk R. Walters, David J. Keil, Zack E. Murrell. 
 - 5th  ed. 
 - Dubuque, Iowa :  Kendall/Hunt,  2006. 
 - xv, 544  p. 
<br/><br/><label>ISBN: </label>0757512148 : 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Plants--Classification.