Yellow montane violet (Viola praemorsa) COSEWIC assessment and status report: chapter 4

Distribution

Global range

Yellow montane violet, as a species, occurs from Vancouver Island to California (Figure 2), chiefly west of the Cascades (Hitchcock and Cronquist 1961).

Figure 2. Global distribution of yellow montane violet.

Figure 2. Global distribution of yellow montane violet

Canadian range

In British Columbia, yellow montane violet is found only along the southeast coast of Vancouver Island and on adjacent islands in the Strait of Georgia (Figure 3). The extant extent of occurrence is about 450 km² (calculated using mapware program and subtracting large areas of open ocean). The historic extent of occurrence was approximately 2,400 km².  The greatest decline in range occurred between 1960-1990. The area of occupancy as based on a 1x1 km grid is 14 km² and based on a 2x2 km grid is 56 km². The actual area of habitat occupied is < 20 ha.

Figure 3. Distribution map of yellow montane violet in Canada.(Solid circles indicate extant locations. Open circles represent extirpated populations. Triangle represents a historic population with uncertain status. Some points represent multiple locations.)

Figure 3.Distribution map of yellow montane violet

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