106 



particularly along the Connecticut River, they form a con- 

 spicuous feature of the vegetation, frequently controlling large 

 areas. Equally characteristic of — and where marked by an 

 asterisk confined to— alluvial soil along the rivers are the follow- 

 ing species : 



Onoclea Struthiopteris Eleocharis diandra* 



EguisetiLm pratense* Eleocharis ovata 



Equisetiim palustre* Carex Grayii* 



Eqimetum fluviatile Carex Tuckermani* 

 Equisetum variegatum Jesupi* Salix longifolia* 



Sagittaria arifolia* Acer Negundo* 



Sagittaria heterophylla Hypericum Ascyron* 



Cy perns erythrorhizos* Ambrosia trifida 



In contrast to the plants in the two preceding lists it will be 

 observed that more than half of the species here cited are boreal 

 in their general distribution, no less than five reaching their 

 southern limit in the east in Connecticut. 



Although the primary object of the present paper is to describe 

 some of the larger and more conspicuous features of plant 

 distribution in this state, such an account would be incomplete 

 without some mention of the eccentricities in range which are 

 exhibited by certain species not heretofore noted. One of the 

 best known examples of this sort is furnished by the persimmon 

 {Diospyros virginiana) , of which there is a well-established colony 

 of more than lOO trees growing near the beach at Lighthouse Point, 

 New Haven, — a station which was probably noticed as long ago 

 as 1831^ (Fig. 5). This tree has been found nowhere else in New 

 England and the nearest locality to the south — in western Long 

 Island — is fully 60 miles removed. An analogous case is afforded 

 by the spike rush Eleocharis quadrangulata, which is abundant at 

 West Pond, Guilford. Although the largest and most distinctive 

 native species in the genus, no other station for it is known within' 

 a radius of 1 10 miles. Similarly, Calliergon trifarium, a handsome 



1 Howe, H. Catalogue of the phaenogamous plants and ferns growing without 

 cultivation within five miles of Yale College, p. 13. New Haven, 1831. No 

 definite station is given. 



