416 F BOTANICAL GAZETTE : [MAY 
taken by Skokie Stream, the plants constitute distinctly a reed 
swamp formation (fig. 2). Extending along on either side of the 
reed swamp is a broad level expanse, intermediate between reed 
swamp and meadow. This may be designated swamp meadow 
(fig. 3). At the outer edges of the swamp meadow, in narrow areas 
that have not been too much disturbed by cultivation, true meadow 
\ ; Scale 
« _—— = + wiles 
r 9 “eee 2 Womérrs 
. 
Ae VAichi\and Pork 
A 
NX 
4 
SN Rovinie 
Laake Gout \ Brarside “of : 
Gook County %, 
1 a 
Py 
Glencoe 
Winnelha 
Fic. 1.—Map of Skokie Marsh; the dotted line represents Skokie Stream 
is commonly present. At certain places, however, there is an 
abrupt transition from swamp meadow to forest. 
In the reed swamp the plants belong to five easily recognized 
associations. Where the stream is deepest (as in fig. 2), aquatic 
or amphibious species, such as Myriophyllum humile,’ Ranunculus 
delphinifolius, and Potamogeton (zosteraefolius?), are common 
near the center. In the shallower parts, the species are supple- 
3 All plant names given in this paper conform with the nomenclature of GRAY’s 
Manual, 7th ed., 1908. 
