26. 
27. 
CONTENTS 
A Revision of the Genus Flaveria. By J. R. Jounston. 
I. Diagnoses and Synonymy of some Mexican and Central Ameri- 
can Eupatoriums. 
II. Synopsis of the Mikanias of Costa Rica. 
III. Notes on the Genus Mimosa in Mexico and Central America. 
IV. Notes on some Polygonums of western North America. 
V. New Spermatophytes of Mexico and Central America. 
By B. L. Rosprnson. 
I. Revision of the Genus Sabazia. By B. L. Roprnson and J. M. 
GREENMAN. 
II. Revision of the Mexican and Central American Species of 
Trixis. By B. L. Ropinson and J. M. GREENMAN. 
III. Revision of the Mexican and Central American Species of 
Hieracium. By B. L. Ropinson and J. M. GREENMAN. 
Iy. Synopsis of the Mexican and Central American Species of Alnus. 
By M. L. Ferna.p. 
V. Diagnoses and Synonymy of Mexican and Central American 
Spermatophytes. By J. M. GrREENMAN 
VI. Some New Species of Mexican and Nicaraguan Dicotyledons. 
y M. L. Fernacp. 
_ New Plants from the Islands of Margarita and Coche, Venezuela. 
By J. R. JoHNsTon. 
A Revision of the Genus Zexmenia. By W. W. Jones. 
I. Descriptions of Spermatophytes from the Southwestern United 
States, Mexico, and Central America. By J. M. GreEnMAN. 
II. Diagnoses and Notes Relating to American Eupatorieae. By 
B. L. Roprnson. 
Studies in the Zupatorieae. 
I. Revision of the Genus Piqueria. 
II. 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. Rosinson. 
