Crataegus macrocarpa

About

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.

Summary from Wikipedia