April, 1908.] 
The Vegetation of Cedar Point 
335 
The facies of this formation exhibit more or less zonation. 
Castalia tuberosa generally forms a Consocies in the deeper part 
of the habitat of the formation while the shallower part of the 
formation often has alternating Nymphaea advena Consocies and 
Nelumbo lutea Consocies. Over a large part of the habitat, 
however, the facies are mingled to such an extent that the con¬ 
socies structure is not evident. 
The Pontederia cordata Society is not ordinarily of large ex¬ 
tent but the plant usually appears in dense ecological families 
and communities. This Society is usually associated with the 
Nymphaea advena and the Nelumbo lutea Consocies in the shal¬ 
lower water of the habitat. 
Fig. 19. The Nelumbo lutea Consocies mingled in the left background 
with the Pontederia cordata Society. The general backgroi nd being the 
Phragmites phragmites Consocies of the Marsh Formation. In the third 
cove south of Biemiller’s Cove. 
The Utricularia vulgaris Society determines a quite conspicu¬ 
ous aspect in midsummer in some of the little bays and inlets 
opening off from the larger body of the cove into the marsh,— 
usually in water of not more than six or eight inches in depth 
with a deep semi-liquid muck bottom. 
The Zizania aquatica Society determines a conspicuous au¬ 
tumnal aspect almost throughout the whole formation except, 
perhaps, in the very deepest part. During midsummer this 
