April, 1908.] 
The Vegetation oj Cedar Point. 
33 1 
“ Salix sp. ” Formation around the lagoon at the northeast corner 
of the peninsula. As exemplified along the Bar the structure is 
as follows: 
Facies: Salix discolor, 
Salix lucida, 
Salix amygdaloides. 
Principal Species: Solidago 
Secondary Species: 
Salix cordata, 
Cornus amomiim, 
Rhus hirta, 
Cephalantlius occidentalis, 
Epilobium adenocaulon, 
Impatiens biflora, 
Teucrium canadense. 
canadensis. 
Lycopus americana, 
Cornus stolonifera, 
Rosa Carolina, 
Cicuta maculata, 
Mimulus ringens, 
Stachys as per a, 
Thaspium barbinode. 
The conditions of environment brought about by a rise in 
water level are such that xerophytic soil with little humus rapidly 
passes through the mesophytic to the hydrophytic stage and this 
is evidently not so well suited to the Salix discolor-lucida Thicket 
Formation as is a similarly situated, humus-rich soil, which, 
with the elevation due to the accumulation of vegetable humus 
has passed from hydrophytic to more mesophytic edaphic condi¬ 
tions, as is ordinarily the case around marshes and ponds. 
In a few places this shrub formation alternates with the 
Calamagrostis Wet Meadow Formation, but, as this is of compara¬ 
tively limited extent as compared with the wet meadow occurring 
in connection with the Cove Habitat near the Laboratory, a dis¬ 
cussion of its structure will be taken up under the treatment of 
the Cove Habitat. 
The Rhus hirta Thicket Formation. 
This formation is sparingly developed along the marsh shore 
of the Bar Section but it is comparatively not vigorous and does 
not form areas of any considerable size. It sometimes borders 
the preceding shrub formation ( Salix discolor-lucida Thicket 
Formation) or the wet meadow formation, or it may directly 
adjoin the Phragmites-Typha Marsh Formation. In many places 
there is a direct transition from the Sand Plain of the Bar Section 
to the Marsh Formation with no intervening shrub or meadow 
zone. 
The cottonwoods in the Bar Section are not of great age and 
they have undoubtedly been such as have accomplished ecesis 
in the edge of the marsh where the disseminules were buried 
under the indrifting sand; conditions almost identical with those 
obtaining along the wet bank of a newly formed beach lagoon. 
In a few places towards the Dune Section Ulmus americana 
seedlings were found along the shores of the marsh under such con- 
