Postelsia 69 
erowing in the latter habitat. Along the humus 
shores the mid beach area is largely tenanted by 
a Carex-Comarum society, which lakeward passes 
into the Hippuris-Equisetum front strand com- 
plex already spoken of The characteristic 
plants of the society are various spécies of 
Carex such as: 
Carex howellii Carex stichensis 
Carex exsiccata Eleocharis palustris 
In some places occur scattered examples of 
Veronica scutellata. Comarum palustre is found 
in considerable quantities among the sedges 
throughout, but reaches apparently its fullest 
development well toward the back. 
Upon the sandy beaches and stream deltas 
of the mid beach region is established a some- 
what complex herbaceous society of mostly per- 
ennial types. The composition varies but the 
most characteristic plants are: 
Agrostis attenuata  Lycopus communts 
A grostis exarata Bromus vulgaris 
Elymus ciliatus Oenanthe sarmentosa 
Carex decidua Galium trifidum pacitficum 
This group does not exhibit signs of stability. 
