UNITED STATES DEPARTMENT OF AGRICULTURE, 



BUREAU OF PLANT INDUSTRY. 



TAXONOMIIC AND RANGE INVESTIGATIONS. 



Washington, D. C, Sept. 12, '10. 



Mr . Walter Deane , 



29 Brewster St., 



Cambridge., Mass . 



Dear Sir: 



your letter addressed to Prof. Hitchcock 

 at his residence has been sent to me for reply. 

 Prof. Hitchc/5k is at present in Mexico, collecting 

 and studying the grasses. 



We shall be glad to examine your speci- 

 mens of Mihlenbergia . This is a particularly 

 troublesome genus and the group, containing M. 

 sylvatica, foliosa, ..mexicana is confusing because 

 the species certainly run together. Scribner dif- 

 ferentiated several varieties that Prof. Hitchcock 

 did not recognize in the Manual because the inter- 

 mediate specimens were more numerous than the 

 forms to which the tiai.es were attached. 



Yours respectfully, 



f 



Scientific Asst. in Byitemfcic Agrostology. 



?. S. Kindly sned them to Prof. A. S. Hitchcock, 

 Systematic Ai^os tologist , Dept. of Agriculture. 



