Crataegus × macrocarpa, is a hybrid between two species of Crataegus (hawthorn), C. laevigata and C. rhipidophylla, both in series Crataegus. A chemotaxonomic investigation comparing flavonoid patterns in C. × macrocarpa and its putative parent species corroborated their supposed relationship. It is sometimes confused with C. × media, the hybrid between C. monogyna and C. laevigata.

Under the rules of botanical nomenclature the name C. × macrocarpa covers all intermediate forms between the two parent species, including backcrosses.

Its fruit persists for an average of 40.6 days, and bears an average of 1.0 seeds per fruit. Fruits average 72.5% water.

...