White wood aster (Eurybia divaricata) COSEWIC assessment and status report: chapter 4

DISTRIBUTION

Global range

Eurybia divaricata occurs in Canada and the United States.  This species is generally common throughout its main range in the Appalachian Mountains, and from New England south to Georgia and Alabama (Figure 2).

Figure 2.  North American distribution of Eurybia divaricata (adapted from Argus et. al, 1987).

Figure 3.  Distribution of Eurybia divaricata in Ontarioand Quebec.

Canadian range

In Canada, Eurybia divaricata occurs in scattered populations in the Niagara Region of southern Ontario and in a few woodlots in southwestern Quebec (Figure 3). Eurybia divaricata is near the northern limits of its range in Ontario and may never have been common or widespread here (R.O.M., 1997). Currently, there are 15 confirmed extant populations in Ontario:

·        Crescent Estates Woodlot

·        Culp’s Woods

·        DufferinIsland

·        Fonthill-Sandhill Valley ANSI (Area of Natural and Scientific Interest) 

·        Marcy’s Woods

·        MillerCreek SwampWoodlot

·        Nelson Quarries

·        North Pelham Valley ANSI

·        OakhillForest

·        South Fort Erie

·        South Fort Erie2

·        ShortHills Provincial Park

¨      Terrace Creek

¨      Cataract Woods

·        St. John’sConservation Area

·        Summer Street Woodlot

·        Two Mile-Four Mile Creek ANSI

¨      Niagara Shores C.A.

¨      Department of National Defense

There have been 10 locations reported in Quebec, 6 of them consisting of isolated clones with very few stems:

·        Venise-en-Quebec

·        Frelighsburg

¨      Petit Pinacle

¨      St-Armand Centre

·        Saint-Blaise

·        Mont St-Gregoire

·        Colline Spruce

·        Saint-Armand

·        Philipsburg

·        Mont Rougement

·        Mont Pinacle

This makes for a total of 25 locations in Canada, although 4 populations (all located in Quebec) have not been confirmed for at least 10 years.

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