. The plant societies of Chicago and its vicinity. Plant ecology; Botany; Botany. 46 THE PLANT SOCIETIES OF most of the rock, to the mesophytic plants of the deeper soil which lies over the crevices. Through rock decay and the accumulation of organic matter a con- siderable soil comes to be developed where there was at first an outcrop of bare rock. The opportunity for a shrubby vegetation eventually. Fig. 27.—Limestone ledge at Stony Island, showing vegetation farther advanced than in ^ig. 2b. The crevice shrubs here are chokecherries (Prunus Virginiana). arrives, especially in the crevices.
. The plant societies of Chicago and its vicinity. Plant ecology; Botany; Botany. 46 THE PLANT SOCIETIES OF most of the rock, to the mesophytic plants of the deeper soil which lies over the crevices. Through rock decay and the accumulation of organic matter a con- siderable soil comes to be developed where there was at first an outcrop of bare rock. The opportunity for a shrubby vegetation eventually. Fig. 27.—Limestone ledge at Stony Island, showing vegetation farther advanced than in ^ig. 2b. The crevice shrubs here are chokecherries (Prunus Virginiana). arrives, especially in the crevices. J^ig. 27 shows such a vegetation getting a foothold. Among the shrubs in such places are the choke- cherry {Prunus Virginiana), ninebark {Physocarpus opulifolius), poison ivy {Rhus Toxicodendron), Rosa humilis, sumach (Rhus typhina), hop tree {Ptelea trifoliata), wild crab {Pyrus coronarid). Still later the way is open for a tree vegetation, at first xerophytic, but ultimately meso- phytic, as the author has frequently observed in the Alleghanies. There can be no doubt but that a temporary mesophytic climax can be. 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
