CONTRIBUTIONS FROM THE GRAY HERBARIUM 
OF HARVARD UNIVERSITY 
New Serigs.— No. LII 
ISSUED 
SEP 28 1917 
. Notes on the Systematic Position of Clibadium, 
with Descriptions of some New Species. 
— 
II. A Revision of the Genus Dimerostemma Cass. 
III. Newand Noteworthy Compositae, chiefly Mexican. 
IV. Descriptions of New Spermatophytes, chiefly from 
the Collections of Prof. M. E. Peck in British 
Honduras. 
By S. F. BLAKE 
HARVARD UNIVERSITY PRESS 
CAMBRIDGE, MASS., U.S.A. 
SEPTEMBER, 1917 
