Lindley’s false silverpuffs (Uropappus lindleyi) COSEWIC assessment and status report: chapter 4

Distribution

Global range

Uropappus lindleyi ranges from southwestern British Columbia disjunctly to Idaho and central Washington and south to Oregon, Utah, Texas, New Mexico, Arizona and California (Cronquist 1955, Chambers 1993, Figure 3). A historic occurrence (1956) is known from the San Juan Islands of northwestern Washington (Atkinson and Sharpe 1993), about 8-12 km south of the Canadian populations.

Figure 3. Distribution of Uropappus lindleyi in North America (based on USDA, NRCS 2007).

Figure 3. Distribution of Uropappus lindleyi in North America (based on USDA, NRCS 2007).

Canadian range

In Canada, Uropappus lindleyi is known only from southeastern Vancouver Island and the adjacent Gulf Islands (Douglas et al. 1998, 2002, Figure 4). The Canadian range of this species is fragmented, as well as being disjunct from its main range in the U.S. The Canadian populations are about 300 km northwest of the nearest extant populations in Washington (University of Washington Herbarium Database 2004) (Figure 3). The Canadian range is less than one percent of the species’ total range in North America (Figure 3 & 4).

Figure 4. Canadian Uropappus lindleyi sites (n= extant site; r= extirpated site).

Figure 4. Canadian Uropappus lindleyi sites (n= extant site; r= extirpated site).

The historical Extent of Occurrence of Uropappus lindleyi in Canada is not known, as the species was first reported in 1974. The current Extent of Occurrence in Canada is approximately 150 km², based on the area of a convex polygon including extant sites. The present area of habitat occupied by the species is 0.01 km² but the Area of Occupancy for the 5 sites, based on a 1x1 km grid, is 5 km² or 20 km² using a 2x2 km grid overlay.

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