82 



Hook, Columbia county, on September 13, 1936, by Dr. Rogers 

 McVaugh, indicating that the plant is possibly on its way down 

 the river. In this respect it differs from Trapa natans, unbe- 

 lievably common in the Crescent section of the Mohawk river 

 above Cohoes, but which has as yet not advanced down the 

 river. 



What will be the next recruit to the flora of the Hudson 

 river? One good guess is Butomus umbellatus L., which has 

 reached the southern end of Lake Champlain, where collected 

 by Knowlton,^ by Muenscher,^ and by Frank Dobbin (August 4, 

 1930). 



New York State Museum 

 Albany, N.Y. 



« C. H. Knowlton. Rhodora 32: 18. 1930. 

 5 Muenscher. W. C. Rhodora 32: 19. 1930. 



