396 



PROCEEDINGS OF THE ACADEMY OF 



[Aug., 



gonum acre ( * ), P. sagittatum ( T ), Xyris caroliniana (* ), Eryngium 

 virginianum (E), Sabbatia angularis (A), while the other association 

 comprises Scirpus pungens ( + ), Rhynchospora glomerata (|), Poly- 

 gonum acre ( ' ), Ptilimnium capillaceum (</*), Juncus canadensis (cT). 

 The swamp on the south side of the ditch is more extensive, surround- 

 ing a central lagoon with water lilies (O). Here also are found pure 

 associations of Typha angustifolia (9), Rhynchospora glomerata (t),. 





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Fig. 6. — Survey of Como Fresh Water Swamp, t , thicket; 0, Nymphcea 

 odorata; 9, Typha angustifolia; f, Potamogeton sp.; |, Panicum crus- 

 galli; =, Sparganium eurycarpum; ± Leersia oryzoides; t , Polygonum 

 sagittatum; +, Scirpus pungens; ©, Scirpus lacustris; E, Eryngium vir- 

 ginianum; *, Xyris caroliniana; S, Solidago tenui folia; M, Vaccinium 

 macrocarpon; (5\ Juncus canadensis; f, Rhynchospora glomerata; A, 

 Sabbatia angularis; ' , Polygonum acre; (/>, Ptilimnium capillaceum. 



Scirpus lacustris (©), Ptilimnium capillaceum (<P) and several mixed 

 associations of species, as illustrated in Fig. 6. The largest asso- 

 ciation is west of the lagoon ; here occur Polygonum acre ( * ) associated 

 with Solidago tenuifolia (8) and Nymphcea odorata (O). Another 

 association is composed predominantly of Juncus canadensis (cT), 



