Foster, Steven. <br/><br/>
Echinacea the purple coneflowers. 

 - Austin, TX. :  American Botanical Council,  1991. 
 - 7 p. 
 - American Botanical Council. Botanical series  ; 301-312 .
 - American Botanical Council. Botanical series  ; 301-312 .
<br/><br/><label>LCCN: </label>73663 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Botánica médica.<br/>Echinacea.