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COSEWIC assessment and update status report on the Athabasca Thrift, ssp. interior in Canada

Population Sizes and Trends

This subspecies occurs only as small populations or as occasional individuals. Gravel pavements, the main habitats, are themselves relatively uncommon and the vegetation on them is very sparse. Species growing on these gravel pavements, therefore, are among the least common species in the Athabasca sand dunes. This subspecies is thought to be one of the most uncommon of the endemics in the Athabasca sand dunes (Harms pers. comm.). There are eighteen herbarium collections of this taxon (Harms et al. 1992); of these, sixteen in Ottawa herbaria (National Herbarium of Canada or the Department of Agriculture Herbarium) were reexamined. The population of this subspecies is very small but its exact size and trends cannot be estimated without quantitative data. There is no evidence, however, to suggest that its numbers have diminished in recent years.