Abstract
The region of extreme southern Quebec, situated adjacent to the Appalachian Mountains, is one of considerable phytogeographic interest, particularly in terms of mountain species which entered Eastern Canada in the postglacial period. Quantitative data gathered from a large number of forest stands in the region are assembled and analyzed to determine the phytosociological and ecological position of Viola rotundifolia, which is considered to be such a species. This information is further used to ascertain the invasion patterns and attempt to explain the present geographical range of this species at its northeastern limits in North America. This analysis should prove useful in assisting to understand the phytogeography of other similar species in this region.
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