April, 1908.] 
The Vegetation of Cedar Point. 
339 
This formation is apparently a rather rapid soil former and 
with the elevation of the ground the more mesophytic conditions 
permit the entrance of the following thicket formation, as around 
the east side of the area of the Calamagrostis Wet Meadow to the 
northwest of the Laboratory: 
The Cephalanthus-Cornus Thicket Formation. 
Facies: Cornus amomum, 
Cornus obliqua, 
Cephalanthus occidentalis, 
Rosa Carolina. 
Principal Species: Sambucus canadensis. 
Secondary Species: 
Salix cordata, 
Salix lucid a. 
Polygonum convolvulus, 
Dryopteris thelypteris, 
Ailanthus glandulosa, 
Rhus hirta. 
Salix amygdaloides, 
Calamagrostis canadensis, 
Solanum dulcamara , 
Platanus occidentalis, 
Ulmus americana, 
This vegetation should be classed rather as a mixed formation, 
perhaps, than as a pure one, it apparently being made up of 
various elements from the other thicket zones on the peninsula. 
The predominating consocies is the Cornus amomum-obliqua 
Consocies, while during the flowering period of the elderberry 
the Sambucus canadensis Society determines in places a con¬ 
spicuous aspect. 
Along the eastern shore of the marsh and wet meadow forma¬ 
tions forming the northward extension of Biemiller’s Cove, con¬ 
siderable sand has blown over in places from the peninsula and 
the bank rises in such places quite abruptly. At such points the 
Rhus hirta Thicket Formation usually occupies this more xero- 
phytic habitat and it, evidently, under such conditions, is suc¬ 
ceeded by the Quercus velutina-imbricaria Forest Formation. 
Where the slope is more gradual, with a more hydrophytic 
soil, usually also with more humus, the normal succession appears 
to be from the wet meadow through the Cephalanthus-Cornus 
Thicket Formation to the Ulmus-Acer Forest Formation. 
The Ailanthus glandulosa Forest Formation. 
An interesting example of an anomalous succession is afforded 
in the near vicinity of the Laboratory and at a couple of other 
stations on the peninsula by the Ailanthus glandulosa Forest 
Formation which is rapidly developing along the shores of the 
cove and Bay in the Dune Section. This Asiatic ruderal tree 
now constitutes a prominent zone occupying the habitat of the 
less hydrophytic of the thicket zones, although often displacing 
