Postelsia 2 
of the beach than is the case with those already 
discussed although even there it must not be 
understood that any sharp demarcation line can 
be drawn. What mainly characterizes this type of 
beach is not alone the profusion of vegetation 
which they sustain but also the comparatively 
large number of species associated, for in no 
oper vhabitat. of the territory explored, are -so 
many species found to a given area as here. 
iis ‘mixed herbaceous society, as the as- 
sociation may appropriately be called, for the 
reason that no one particular species seems to 
preponderate appreciably, contains a few vigor- 
ous annuals, yet the majority of the plants are 
strong biennials or perennials. The most com- 
mon species of the society are:- 
Elymus glaucus Lathyrus maritimus 
Elymus borealis Vicia gigantea 
Bromus pacificus Oenanthe sarmentosa 
Bromus sitchensis  Heracleum lanatum 
Carex cryptocarpa Stachys ciliatus 
Scirpus microcarpus Scrophularia californica 
Alsine brachypetala Galium vaillantii 
This does not exhaust the list of plants which 
