Tetraploid 10-stamen red-fruited hawthorn of found across North America. One of two possible presumptive parents in C. subg. Americanae of allopolyploids C. douglasii and C. ×suksdorfii.
Folio Media
Project 832: T. A. Dickinson, S. Han. 2023. What is Suksdorf’s hawthorn? revision of the western North American 20-stamen black-fruited hawthorns (Crataegus series Douglasianae, Rosaceae subtribe Malinae). Journal of the Botanical Research Institute of Texas. 17 (1):151-189.
Viewing Folio F1096 Crataegus macracantha Lodd. ex Loudon containing 4 media.