OHIO STATE ACADEMY OF SCIENCE. 73 
Xi, DHE PLANT SOCIETIES. 
1. Hydrophyte societies. 
a. Plankton. 
b. Societies of the lake shore, ponds, streams, and 
canals; as the pondweed societies, the pond-lily 
society, etc. 
c. Uliginous societies. 
d. Marsh and swamp societies ; as reed-grass-rush 
society, sphagnum swamp, swamp thicket, tam- 
arack forest, etc. 
e. Wet meadow societies; as sedge-meadow 
society, etc. 
f. Sandbar societies. 
g. Belt or zonal arrangement of hydrophyte 
societies. 
Mesophyte societies. 
a. The forest societies, pure and mixed, dicotyl- 
edonous and coniferous. 
b. Thicket societies; underbrush and bramble. 
c. Vertical strata in the forests. 
d. Natural meadow and prairie societies. 
e. Pasture-land societies. 
f. Railway, roadside, waste field, and city lot 
societies. 
ge. Culture societies. 
3. Xerophyte societies. 
a. Sand dune and sand ridge societies. 
b. Plants of rocky bluffs, hills, and high ridges. 
c. Rock and dry wood societies. 
4. Halophyte societies. 
a. Salt lick and salt spring plants. 
b. General consideration of the partial halophytes 
of the state. 
iN) 
XII. PLANT REGIONS OF THE STATE. 
1. Determination of the extent of distinct plant 
regions and their boundaries. 
