Bell, C. Ritchie. <br/><br/>
Plant variation and classification / 
C. Ritchie Bell. 
 - Belmont, California  Wadsworth Pub.  1967. 
 - vi, 135  ill.  24 cm. 
<br/><br/> INcludes bibliographical references (p. 121-125). 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Botany--Classification.<br/>Botany--Variation.