"Species Details - Crataegus sheila-phippsiae J. B. Phipps & O'Kennon var. saskatchewanensis J. B. Phipps & O'Kennon, University of Alberta Vascular Plant Herbarium." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/g/1-19930. Accessed 12 May. 2024.
There are 2 specimens of this Species.