STORM BEACH 107 
virginicum, 350 north at 9 feet, and rather generally along this part of the 
shore: Impatiens biflora, 350 north and scattering to 110 south at 9 feet; 
Juncus canadensis, 400 north at 8.5 to 9 feet; Lycopus virginicus, 340 to 360 
north at 9 feet; Prunus serotina, 355 north at 9 feet; Psedera quinquefolia, 110 
to 150 south at 9 feet; Pyrus malus, 320 north at 8.5 feet; Rhus toxicodendron, 
110 south and 200 north at 9 feet and generally along the shore at this and 
slightly higher levels; Rhus vernix, 115 south at 9 feet; Rosa carolina, 200 to 
400 north at 8.8 and 9.2 feet, and 150 south at 9 feet; Rubus allegheniensis, 
350 north at 9 feet; Sambucus canadensis, 345 north at 8.5 feet, and a clump 
5 by 15 feet 480 north at 9.2 feet; Solidago canadensis, 350 north at 8.7 feet; 
Vernoma sp., 300 north at 8.5 feet. 
THE SUPRA-LITTORAL BEACH ON THE WEST SHORE OF THE HARBOR. 
Only a small portion of the west shore above the 8-foot level is now in really 
natural condition. Starting from 620 south by 680 east and going northward, 
we find that the upper levels have been much changed. Most of the storm- 
beach up to the corner of the tide-pond (180 south by 380 east) has been altered 
by the construction of a walk and a pump-house and by filling in along the 
lower edge of the garden of the Station for Experimental Evolution. The only 
characteristic storm-beach plants found along this part of the shore are 
Baccharis halimifolia, Iva oraria, and Solidago sempervirens. A few beach- 
plants from the belt below may now and then occur on this part of the shore 
slightly above the 8-foot level, e. g., Atriplex patula and Scirpus americanus. 
Baccharts is a robust, composite shrub 2 meters high, of which two widely 
separated plants have been found along this shore between the 8.5 and 9-foot 
levels (500 south by 650 east, 300 south by 620 east). It is interesting to note 
that this species is represented by only three other specimens about this harbor 
(2,200 north by 870 west, 160 south by 1,200 east, 240 south by 1,210 east). 
It is abundant, however, on the sandy shores of the Outer Harbor. 
Iva is an interesting half shrubby composite, sometimes a meter high, which 
is confined to the Marsh and its eastern and western borders (plates xr and 
x11). On the shore we are now considering there is a large clump of these 
plants near 310 south by 580 east at 8 to 8.3 feet, and a single plant at 500 south 
by 670 east, while on the north shore of the tide-pool (20 south by 260 to 370 
east) some 20 clumps of Iva have established themselves on gravelly soil near 
the 8-foot level. 
Solidago sempervirens is scattered in dozens along this whole shore, at and 
just above the 8-foot level, from the causeway to the tide-pond. It is most 
abundant on a rather dry, sandy point of the shore near 260 south by 590 east. 
About the tide-pool at 100 south by 300 east only two storm-beach plants are 
found. About a dozen Solidagos are scattered along the road forming the 
southern border of the pool. On the gravelly outer edge of the walled wharf 
from the tide-pool westward and northward to 540 north, at the 8 to 9 foot 
levels, 75 or 80 Solidagos are present; 50 are between 200 north and 400 north. 
In some seasons these plants are accompanied by a few of Salsola kali. 
From 540 north to the Spit, on this side the shore, above the 8-foot level, 
has been less modified than the part south of here, except for the four wharves 
near, 1,100 north, 1,500 north, 2,100 north, and 2,200 north, respectively. This 
shore is of a sandy loam, or near the entering rivulets, of black peaty muck. 
