UNITED STATES DEPARTMENT OF AGRICULTURE, 

 BUREAU OF PLANT INDUSTRY. 



TAXONOM1C AND RANGE INVESTIGATIONS. 



Washington, D. C, December 20, 1910. 



Mr. Walter Deane, 

 29 Brewster St . , 



Cambridge-, Mass , 



Dear Sir: 



Your favor of Dec. 15 received. Prof. Hitchcock suggests 

 that I mention that the knowledge of Panicum has undergone 

 many and great changes since the days of Dr. Vasey and even 

 of Prof. Scribner and that identifications made so long ago 

 should not be given too much weight. 



I am sorry the last package sent you was injured in the 

 mails, thank you for mentioning it. 



We are interested in your statement that the revision of 

 Panicum contains twenty-one species and varieties occurring 

 within the manual region which are not in the manual. We 

 knew there were several but did not know that there were so 

 many. Those Hew Jersey extensions for a few species were 

 shown by specimens from Philadelphia Academy long after Gray's 

 Manual was out. Species represented within the Manual range 

 by one or two ballast plants only were not included in the 

 Manual . This is the case of P. ads per sum. I think it would 

 be interesting to readers of P.hodora if you gave a list of 



