275 



LIST OF THE SPECIES OF THE CAREX OEDERI PUMILA- 

 CYPERUS RIVUEARIS ASSOCIATION 



Dominant Species 

 Care.v ocdcri pit mil a 

 Rynchospora capillacca lez'iseta 

 Pi] 1 1 bristylis casianea 

 Ranuncnhis sccleratus 



Relic Species 

 Triglochiii pahistris 



Invading Species 

 Potentilla anserina 

 Juncits balticus littoralis 

 Liniini virgimamiui 



Cy penis r'n 'iila ris 

 Care.v a urea 

 Blcocharis aciiiiiinata 



Sali.v syrticola (small plants) 

 Lobelia kaliiiii 

 Utriciilaria coniuta 



THE SABATIA-LINUM ASSOCIATION 



Immediately above the preceding association and sending out 

 many invaders into it, is the Sabatia-Linuni association, which is al- 

 most the exact counterpart of that fomid by Jennings (1909:355) 

 on Presque Isle. One of the dominant species of this association, 

 Sabatia angularis, occurs in the general region around the head of 

 Lake Michigan, but is locally absent in the Beach region. The pres- 

 ence of this association is usually an indication that a given area of 

 ground will be occupied by prairie rather than by forest associations. 



LIST OF THE SPECIES OF THE SABATIA-LINUM ASSOCIATION 



Dominant Species 

 Linuin virginianum 



Secondary Species 



Lobelia kaluiii 



Utricularia coniuta 



Aster ptariiiicoides 



Carex crawei 



Gentiana procera (small plants) 



Relic Species 

 Bleocharis acinuinata 

 Rynchospora capillacca leviseta 



Campanula aparinoides 

 Spiranthes ccniua 

 Gerardia paiipercida 

 Liparis loeselii 



Care.v ocdcri piimila 

 Care.v aiirca 



