1921] Third Report on Floral Areas 219 



rarest species. The latter is known only from Ft. Kent (A. A. Faton) 

 and from near the confluence of the St. John and Big Black Rivers 

 (St. John and Nichols), the former from Ft. Kent (J. R. Churchill) 

 and, in Vermont, Willoughby (C. H. Tilton) and St. Johnsburv 

 Miss Inez Howe). Equisetum varieyatum and its variety Jcsitpi 

 occur at scattered stations in the larger calcareous areas of New 

 Fngland south to western Connecticut. It is a curious fact that, 

 though their general ranges are the same, they have apparently never 

 been collected at the same place nor nearer than 20 miles to each 

 other. 



IX. RlVER-VALLEV 



Equisetum litorale Equisetum palustre 



Equisetum pratcnse 



These three species show a discontinuous range, not matched in 

 any group heretofore distinguished. They are chiefly, though not 

 entirely, confined to the valleys of the larger rivers and to the Cham- 

 plain Valley — a distribution perhaps due to a preference for alluvial 

 soils, to which, however, they are by no means restricted. E. litorale 

 is known from the St. John, Penobscot, Kennebec and Androscoggin 

 valleys in Maine; on the lower Merrimac; along the shores of Lake 

 Champlain; and on the Connecticut at Stewartstown, Lebanon and 

 Walpole, N. H., and Westminster, Vt. E. palustre occurs in the 

 same valleys, except that of the Penobscot, extending south along 

 the Connecticut to Fast Windsor and Lyme, Conn., and is found 

 besides at Brandon, Willoughby Lake and near Lake Memphremagog 

 in Vermont. E. pratcnse has a somewhat more irregular distribution. 

 It is known only from the St. John, Kennebec, Connecticut and 

 Housatonic valleys, and from Newark and Brandon, Vt. 



X. Western New England only. 



Equisetum hyemale, var. intermedium 



This is referable to a small group to which Trolllus laxus and 

 Hydrastis canadensis of our first report belong. They are species of 

 more or less wide range in the central United States, touching our 

 area only along its western border and but rarely there. They pen- 

 etrate eastward no further than the central lowland of Connecticut. 



