Blake, S. F.  1892-1959. <br/><br/>
Revisions of the genera Acanthospermum, Flourensia, Oyedaea, and Tithonia, 
by S. F. Blake. 
 - Washington,  Govt. print. off.,  1921. 
 - v, 383-436, vii-viii p.  pl. 23  25 cm. 
 - Smithsonian institution. United States National museum. Contributions from the United States National herbarium,  v. 20, pt.10 .
<br/><br/> "Bulletin of the United States National museum." 
<br/><br/><label>LCCN: </label>agr21000707  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Compositae--Classification.
<br/><br/><label>LC Class. No.: </label>QK1  / .U5 vol. 20, pt. 10