112 THE RELATION OF PLANTS TO TIDE-LEVELS 
The 20 or 25 other species of plants found on the higher parts of the Marsh 
are never dominant over any appreciable area, but like many of the 15 possible 
dominants mentioned above, they may be scattered more or less frequently among 
the species dominating any area. Some of these scattered species may be con- 
fined to one or a few small portions of the Marsh, while others, like the Atriplex 
mentioned, may be rather generally, though sparsely, distributed over the Marsh 
between the 8-foot and 9-foot levels. Certain of these occasional species are, 
however, rather prominent because of their size, e. g., Myrica and Sambucus; 
or because of the brilliancy of their flowers, as is true especially of Asclepias 
incarnata and Hibiscus moscheutos. 
Further details of the distribution of these plants on the high levels of the 
Marsh must be sought in the map of Professor Conard. What has been said 
here is merely to indicate the nature of the marked difference between the plant 
covering of this wet, partly brackish, sunny marsh and that of the gravelly or 
sandy, well-drained Spit, or that of the wet, shady, western shore of our harbor. 
