Northern Range Limit of Opuntia fragilis and the Cactaceae is 56°N, Not 58°N

@inproceedings{Gorelick2015NorthernRL,
  title={Northern Range Limit of Opuntia fragilis and the Cactaceae is 56°N, Not 58°N},
  author={Root Gorelick},
  year={2015}
}
Abstract Two of the most used sources for distributions of cacti (Cactaceae) indicate the family's northern range limit is either 58°N or 58°15′N for Opuntia fragilis. However these sources overstate the range limit by almost two degrees, an error that probably originated as a simple misreading of the latitude of Fort St. John. I discuss records of O. fragilis at and just south of 56°17′ N along the Peace River valley between Fort St. John, British Columbia and Peace River, Alberta, as well as… 
Freeze-Tolerance of Cacti (Cactaceae) In Ottawa, Ontario, Canada
TLDR
It is indicated that freeze tolerance of cacti in eastern Ontario may be a function of snow cover, rather than polyploidy, which would provide a larger pool of potential species that could expand to colder regions.
Opuntia fragilis in the San Juan Islands
  • R. Gorelick
  • Environmental Science
    Cactus and Succulent Journal
  • 2017
TLDR
While there are many documented locales for Opuntia fragilis in the San Juan Islands — see Figure 1 based on the aforementioned twenty herbarium records — this species is not common, and seems to grow almost, but not quite exclusively, on smaller islands, some tiny, i.e. fractions of an acre.
Spineless Opuntia fragilis

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