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Phipps, J. B. 1998. Introduction to the red-fruited hawthorns (Crataegus, Rosaceae) of western North America. Canadian Journal of Botany. Vol. 76, pp. 1863-1899.
Dickinson, T. A., Yan, B. X., Han, S. and Zarrei, M. 2021. Niche Shifts, Hybridization, Polyploidy and Geographic Parthenogenesis in Western North American Hawthorns (Crataegus subg. Sanguineae, Rosaceae). Agronomy. Vol. 11(11), p. 2133.