. The plant societies of Chicago and its vicinity. Plant ecology; Botany; Botany. 4° THE PLANT SOCIETIES OF tation originates outside the swamp, and may be regarded as xerophytic; however, it often encroaches upon the swamp as the latter develops. At Thornton there is a dead swamp which is now almost entirely occu- pied by this xerophytic bog margin flora, only a few of the original swamp plants now remaining. Near Morgan Park is a bog margin flora without a bog; a shallow trench has been dug and in this trench there have appeared various peat bog plants, e. Sphagnum. These con-. FiG. 22.—
. The plant societies of Chicago and its vicinity. Plant ecology; Botany; Botany. 4° THE PLANT SOCIETIES OF tation originates outside the swamp, and may be regarded as xerophytic; however, it often encroaches upon the swamp as the latter develops. At Thornton there is a dead swamp which is now almost entirely occu- pied by this xerophytic bog margin flora, only a few of the original swamp plants now remaining. Near Morgan Park is a bog margin flora without a bog; a shallow trench has been dug and in this trench there have appeared various peat bog plants, e. Sphagnum. These con-. FiG. 22.—Encroachment of bulrushes on Cakiniet lake, showing how plants may destroy lakes. siderations show that bog margin floras, though associated with most bogs, are not necessarilv genetically connected with them. A word may be said about undrained swamps among the active dunes. The conditions here, of course, are far more severe than in ordi- nary peat bogs and only a few spedes are able to endure in such a hab- itat. The most typical herb vs, Jmicus Balticus littoralis. Seedlings of the Cottonwood, as well as the long-leaved and glaucous willows, ger- minate in these wet depressions. Reference will be made to these plants in connection with the dunes. In the morainic portions of our territory there are few if any peat bogs as described above, although they are usually more typical of moraines than of other topographic areas. On account of the clay soil which characterizes the morainic uplands there are many patches of swampy woods throughout the district. Shallow depressions of this. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Cowles, Henry Chandler, 1869-1939. Chicago, The Geographic Society of Chicago
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1901
