Proceedings of the American Academy of Arts and Sciences. 
Vou. XLII. No. 1.— May, 1906. 
ISSUED, 
MAY 24 1906 
CONTRIBUTIONS FROM THE GRAY HERBARIUM OF HARVARD 
UNIVERSITY. 
New Series. — No. XXXII. 
STUDIES IN THE EUPATORIEAE. 
I. Revision of the Genus Piqueria. 
Il. Revision of the Genus Ophryosporus. 
III. The Genus Helogyne and its Synonyms. 
IV. Diagnoses and Synonymy of Eupatorieae and of certain other 
Compositae which have been classed with them. 
By B. L. RoBINson. 
