Proceedings of the American Academy of Arts and Sciences. 

 Vol. XLII. No. 1. — May, 1906. 



CONTRIBUTIONS FROM THE GRAY HERBARIUM OF HARVARD 



UNIVERSITY. 



New Series. — No. XXXII. 



STUDIES IN THE EUPATORIEAE. 



I. Revision of the Genus Piqueria. 

 II. Revision of the Genus Ophryosporus. 



III. The Genus Helogyne and its Synonyms. 



IV. Diagnoses and Synonymy of Eapatorieae and of certain other 



Compositae which have been classed with them. 



By B. L. Robinsox. 



