Foster, Steven. <br/><br/>
Echinacea :  the purple coneflowers 
/by Steven Foster 
 - Austin, TX. :  American Botanical Council,  1991 
 - 7 p. 
 - American Botanical Council. Botanical series  ; 301 .
 - American Botanical Council. Botanical series  ; 301 .
<br/><br/><label>LCCN: </label>99278 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Achillea Millefolium.<br/>Botánica médica.<br/>Echinacea.