Marsh St. John's Wort is ranked SH in Saskatchewan. According to provincial records, it was observed three times from 1954-1975, followed by ~50 years of not being observed in the province. It was rediscovered in 2023 near the Manitoba border, although the provincial rank hasn't yet been updated.
This is one of two new populations that I found this weekend, >150km west of the closest historical observation by La Ronge. The other population is located closer to Patuanak and will be posted at a later date.

Estimated 1000+ individuals at this location.