394 PROCEEDINGS OF THE ACADEMY OF [Aug. , 



(abundant), Panicum crus-galli (occasional), Scirpus pungens. Then 

 at the eastern end, I noted in the water strip Juncus canadensis, J. 

 debilis, Cyperus dentatus var. ctenostachys , C. erythrorhizos, Scirpus 

 pungens, Polygonum sp., Panicum crus-galli. On a small rounded 

 bar in the lake near the ocean grew in the summer of 1908 

 Panicum crus-galli, Polygonum acre, Cyperus erythrorhizos, C. Nuttallii. 

 Where a small spring enters the lake, I found Nasturtium officinale, 

 Polygonum acre and Spirogyra sp. 



The third strip on the south side of the lake consists of plants which 

 occupy low sandy slopes. Such are Myrica carolinensis , Solidago 

 sempervirens, Panicum virgatum, Strophostyles helvola, Rhus copallina, 

 Baptisia tinctoria, Cyperus dentatus (proliferated sedge), according to 

 my notes. 



The seaward end of the north shore has been graded. Beginning 

 at the edge of the improvements(?) and walking westward along the 

 shore, the following strips of vegetation were recognized and studied: 

 (1) the marsh strip at the edge of the water; (2) the dry sandy strip; 

 (3) the forest strip. The marsh strip, proceeding westward, is charac- 

 terized by Scirpus pungens, Polygonum acre, Cyperus erythrorhizos, 

 Polygonum sagittatum, Gerardia purpurea, Ptilimnium capillaceum, 

 Panicum crus-galli (nearly always at the water's edge). A small 

 stream which enters between the pine woods showed in its expanded 

 portion the white water lily, Nymphcea odorata, and at the edge Panicum 

 crus-galli, Polygonum sagittatum and P. acre.. Passing a sharp bend 

 of the shore the marsh vegetation increases in density with the asso- 

 ciation of Scirpus pungens, Gerardia, purpurea, Polygonum acre, P. 

 sagittatum, Ptilimnium capillaceum, Hypericum canadensis, Bidens 

 frondosa, Hibiscus moscheutos, Scirpus cyperinus, Panicum crus-galli. 

 The bur reed, Sparganium euycarpum, forms a small association at 

 the western end of the lake, while in front of the trolley embankment, 

 in water six inches deep, was found an association of Panicum crus- 

 galli, Cyperus erythrorhizos and Glyceria obtusa. Here the marsh ex- 

 pands into a triangular area, where I collected Polygonum sagittatum, 

 P. acre, Cladium mariscoides, Scirpus pungens (abundant), Eryngium 

 virginianum, Solidago tenuifolia, Panicum virgatum, Gerardia purpurea, 

 Ptilimnium capillaceum, Iris versicolor, while in another portion of 

 the marsh, alternating with the dry ground, grew Alnus serrulata, 

 Aspidium thelypteris, Cladium mariscoides, Aster subulatus and 

 Hibiscus moscheutos. 



The second strip, or that of the treeless dry ground, is characterized 

 by its extensive clumps of Panicum virgatum, with which grows Poly- 

 gala cruciata. 



