April, 1908.] The Vegetation of Cedar Point. 295 



d — The Potamogeton Formation, and 



The Castalia-Nymphaea Formation, and 

 The Decodon-Persicaria Formation, and 

 The Cephalanthtis-Cornus Formation, and 

 ' The Rhus-hirta Formation, and 



The Ulnms-Acer Forest Formation. 



C — The Beach-Sand Plain-Thicket-Forest Succession. 



a — The Lower Beach. . .The Chlamydomonas Formation, 



b — The Drift Beach The Cakile-Xanthium Formation, 



c — The Sand Plain TheArtemisia-PanicumFormation, 



d — The Rhus-Prunus-Toxicodendron Thicket Formation, 

 e — The Quercus velutina-imbricaria Forest Formation. 



D — The Beach-Sand Plain-Heath-Forest Succession. 



a — The Lower Beach. . .The Chlamydomonas Formation, 



b — The Drift Beach The Cakile-Xanthium Formation, 



c — The Sand Plain The ^4 rtemisia-Panicum Formation , 



d — The Heath The Arctostaphylos-Juniperus 



Heath Formation, 

 e — The Quercus velutina-imbricaria Forest Formation. 



E — The Dune and Blowout Successions. 



a — ^The Ammophila Fringing-Dune Formation, 

 b — The Elymtis Dune Formation, or 



The Andropogon Dune Formation, 

 c — The Prunus-Rhus Dune Thicket Formation, or 



The Arctostaphylos-Juniperus Heath Formation. 



a — The Artemisia-Panicunt Blowout Formation, 

 b — The Arctostaphylos-Juniperus Heath Formation. 

 (The Secondary Catalpa Blowout Formation). 



F. — The Bay-Marsh-Wet Meadow-Thicket-Forest Succession. 



A. The Beach Habitat. 



a — Same as under the Beach-Sand Plain-Thicket-Forest 

 Succession. 



B. The Marsh Habitat. 

 a — The Scirpus Formation, 



b — The Phragmites-Typha Marsh Formation, 



c — The Salix discolor-lucida Thicket Formation, or 



The Calamagrostis canadensis Wet Meadow Formation, 

 d — The Rhus hirta Thicket Formation, 

 e — The Ulmus-Acer Forest Formation. 



C. The Cove Habitat, 

 a — (The Chara Formation), 



b — The Potamogeton Formation, 



c — The Castalia-Nymphaea Formation, 



d — The Phragmites-Typha Marsh Formation, 



e — The Calamagrostis canadensis Wet Meadow Formation, 



