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Columbia quillwort (Isoetes minima) was designated as Endangered by the Committee on the Status of Endangered Wildlife in Canada (COSEWIC) in 2019 based on the following criteria: small distribution range and decline or fluctuation (Extent of Occurrence [EOO] and Index of Area of Occupancy [IAO] well below thresholds, there are fewer than five locations and there is an inferred decline in habitat area and quality due to ongoing threats); small and declining number of mature individuals (no subpopulation has more than 1000 individuals and continuing decline is inferred due to a decline in habitat quality). It is anticipated to be listed in Canada on Schedule 1 of the Species at Risk Act (SARA). In British Columbia, Columbia quillwort is ranked S1S2 (Critically imperiled/Imperiled) by the B.C. Conservation Data Centre, and is on the provincial Red list. It is globally ranked G1G2 (Critically imperiled/Imperiled). The main threats are drought associated with climate change and recreational activities. Dwarf hesperochiron (Hesperochiron pumilus) was designated as Endangered by COSEWIC in 2019 based on the following criteria: small distribution range and decline or fluctuation (EOO and IAO are well below thresholds, there are fewer than 5 locations and there is an inferred decline in habitat area and quality due to ongoing threats); small and declining number of mature individuals (current population size is below threshold of 2,500 plants, no population is greater than 250 mature individuals, and continuing decline is inferred due to a decline in habitat quality and habitat); very small or restricted population (population is fewer than 250 mature individuals). It is anticipated to be listed in Canada on Schedule 1 of the Species at Risk Act (SARA)1. In British Columbia, dwarf hesperochiron is ranked S2 (Imperiled) by the B.C. Conservation Data Centre and is on the provincial Red list.
B.C. Ministry of Environment and Climate Change Strategy. 2021. Recovery Plan for Columbia Quillwort (Isoetes minima) Dwarf Hesperochiron (Hesperochiron pumilus) and Hairy Paintbrush (Castilleja tenuis) in British Columbia. B.C. Ministry of Environment and Climate Change Strategy
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Keywords: Columbia quillwort, IIsoetes minima, Dwarf Hesperochiron, Hesperochiron pumilus, and Hairy Paintbrush, Castilleja tenuis, species at risk, selkirks, hemiparasite, Endangered, red list, S1, S2, S1S2, G1G2, G4, G5, BC, British Columbia, Castlegar, Selkirk Mountain Range, Monashee Mountain Range, vascular plants
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