[.-SOME RECENT TOLLECTTONS OF MEXICAN GRASSES. 



By F. Lamson-Scribner and Elmer D. Merrill. 



INTRODUCTION. 



In thi.s paper are enumerated 227 species and varieties of Mexican 

 grasses, of which 11 species and 1 variety are described as new. The 

 specimens on which the list is based inchide the following- recent col- 

 lections from Mexico. 



Forty-four specimens collected bv Mr. C. L. Smith in 1894, chiefly 

 in the State of Vera Cruz; 100 specimens collected in 1897 by Dr. J. N. 

 Rose in the Sierra Madre Mountains and along the Pacific coast; 122 

 specimens collected by Dr. E. Palmer in 1896, chiefl}^ on the western 

 coast; 50 specimens collected l)v Dr. E. Palmer in 1897, chiefl}^ from 

 the State of Durango; 98 specimens collected by Dr. E. Palmer in 

 1898, chiefly from the State of Coahuila: a collection by Mr. C. G. 

 Pringle in 1896 from the State of Colima, and another in 1899 by the 

 same collector from the State of Vera Cruz; and -40 specimens col- 

 lected by Mr. E. W. Nelson in 1899 from the State of Chihuahua. In 

 addition to these collections are also included the few species secured 

 by Messrs. Rose and Hough in 1899, a few by Mr. Pringle previous to 

 1896, and several by Mr. J. G. Smith in 1892. 



Since the publishing of Fournier's Mexican Plants in 1881, consider- 

 able work has been done on the grass flora of Mexico, but the publica- 

 tions on the subject are widely scattered throughout the periodical 

 literature. The only recent articles dealing entirely with Mexican 

 g]"asses are ''A List of the Grasses Collected by E. Palmer in the 

 Vicinity of Acapulco, Mexico, 1894-95," hy F. Lamson-Scribner;^ 

 ""Some Mexican Grasses Collected by E. W. Nelson in Mexico, 

 189-J^-95," by F. Lamson-Scribner and Jared G. Smith;' and Circular 

 No. 19 of the Division of Agrostolog}^ on ''New or Little Known 

 Mexican Grasses," which was issued January 2, 1900. In order to 

 make the present paper more complete, the grasses enumerated in Cir- 

 cular No. 19 have been included, each species that was considered in 

 that circular being marked with an asterisk. 



^ Bui. 4, Division of Agrostology, U. S. Department of Agriculture. 



