Systematik und Pflanzengeographie. 129 



Xamson-Scribner, F. and Merrill, Eimer D., Some recent 

 collections ofMexican grasses. 



— — and — — , Notes on Panicum mtiditm Lara., Panicum 

 scoparium Lara, and Panicum puhescens Lam. 



— — and Ball, Carleton R., Miscellaneous notes and 

 descriptions of new species. (Division of Agrostology, 

 U. S. Department ofAgriculture. Bull. XXIV. p. 54.) Washington 

 (Government Printing Office) 1900. 



The three articles in question continue the studies on American 

 grasses. In the first paper there is a descriptive account of a 

 collection of 44 specimens of grasses made by Mr. C. R. 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. Palm er in 1896, chiefly on the western coast; 

 50 specimens collected by Dr. E. Palm er in 1897, chiefly in 

 the State of Durango ; 98 specimens collected by Dr. E. Palme r 

 in 1896, 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 collected by Mr. E. W. Nelson in 

 1899 from the State of Chihuahua. In addition to these collections 

 there are also included the few species secured by Messers. Pose 

 and Hough in 1899, a few by Mr. Pringle previous to 1896, 

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



The new species described in this paper are Iripsacum 

 pilosum Scribn. and Merrill. The plant is at once recognized by 

 its broad and rather soft pubescent leaves and hispid sheaths. 

 Collected on the road between Colotlan and Bolanos, State of 

 Jalisco. Andropogon Pringlei Scribn. and Merrill, Valley of Mexico, 

 Federal District. This species belongs to the subgenus ÄrtJiro- 

 lophis with. swollen upper sheaths. Paspalum prostratum Scribn. 

 and Merrill. Low lands near Patzcuaro, State of Michoacan. 

 Paspalum Rosei Scribn. and Merrill. Foothills of the Sierra Madre 

 Mountain*, between Pedro Paulo and San Blascito. Panicum 

 {Syntherisma) hadium Scribn. and Merrill. Sierra de San Felipe, 

 State of Oaxaca, altitude between 2,300 and 2,800 m, Panicum 

 (Dimorphostachys) unispicatum. Scribn. and Merrill. Valley of 

 Oaxaca, State of Oaxaca. This species belongs to the group on 

 which Fournier based his genus Dimorphostachys, and is related 

 to the South American Panicum monostachyum, but is abundantly 

 distinct, Muhlenbergia densiflora Scribn. and Merrill. Lava beds, 

 Serania de Ajusco, altitude 3,000 m, Federal District; Sierra de 

 San Felipe, altitude 3,000 m, State of Oaxaca. Muhlenbergia 

 ligulata (Fourn.) Scribn. and Merrill. Durango, State of Durango, 

 in rieh, moist soil in gardens and fields. Agrostis Rosei Scribn. 

 and Merrill. Sierra Madre Mountains, State of Zacatecas. Tristachya 

 laxa Scribn, and Merrill, State of Durango. Readily distinguished 

 from the other species in this genus by its stout culms, lax 



Botan. Centralbl. Bd. LXXXVI. 1901. 9 



