Miller Pond Lillies of Northeastern United States. 13 



tauqua Lake, N. Y., the number ranges from 9 to 16, but in 80 

 percent lies between 10 and 13 (inclusive) with a well marked 

 maximum (36.1 percent) on 12. 



I have referred to these plants as types rather than species 

 because there is every reason to believe that each is an aggre 

 gate of several well defined forms. The erect, subterete-pe- 

 tioled plant is the true Nymphcea advena of Aiton* (type local 

 ity probably Philadelphia, Pa.). The floating, flat-petioled 

 forms may for the present stand as Nymphcea variegata (Engel- 

 mann). f 



*[Nympha~\ advencea Alton, Hortus Kewensis, II, p. 226, 1789. 

 f [Nuphar advend] var. variegatum Engelmann in Gray, Man. Bot. 

 Northern U. S., 5th ed. p. 57, 1867. Type probably from Michigan. 



EXPLANATION OF PLATE. 



Upper figure, NympJma variegata (Engelmann). Photographed at 

 Lake Titus, near Malone, Franklin County, New York, by E. W. 

 Nelson. 



Lower figure, Nymphc&a advena Aiton. Photographed at Monteur's 

 Pond, Knox County, Indiana, by Robert Ridgway. The head of a man 

 standing among the lily leaves may be distinguished near centre of this 

 picture. 



