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COSEWIC assessment and update status report on the Bluehearts in Canada

Distribution


Global Range

Buchnera americana is extant in 11 states from Ohio and Indiana to Georgia and Missouri (The Nature Conservancy 1997) (Figure 2). The areas of greatest concentration are in Tennessee, Kentucky, Arkansas and Missouri (Brownell 1981, The Nature Conservancy 1997). It is considered to be extirpated from Pennsylvania (Rhoads and Klein 1993), Michigan, and New Jersey and a historical occurrence in D.C., Delaware, Maryland, North Carolina and New York (The Nature Conservancy 1997). Its status in 6 southern states is unknown.


Figure 2: Distribution of Bluehearts in North America

Figure 2: Distribution of bluehearts in North America (map from Brownell 1983).

Map from Brownell 1983.


Canadian Range

In Canada, this species is confined to a 10 km stretch of Lake Huron shoreline in south- western Ontario (Figure 3). Its known geographical range in Ontario has not changed since 1981 when fairly extensive field studies were conducted in the Ipperwash/Port Franks area.


Figure 3: Distribution of Extant Sites of Bluehearts in Ontario

Figure 3: Distribution of extant sites of bluehearts in Ontario(map from White, Maher and Argus (1983).

Map from White, Maher and Argus (1983).