[1] It is an excellent small ornamental tree up to about 5 meters in height, with deep red fruit that contain 1 or 2 pyrenes.

[1] An atypical seedling from C. mexicana (which is often referred to by the illegitimate name Crataegus pubescens Steud.)

appeared in 1873 among plants being cultivated at the Arboretum de Grignon, France.

[1] The male parent was thought at the time to be C. crus-galli, but that parentage produced C. x lavalleei, which looks quite different.

[1] The Latin binomial Crataegus × grignonensis (or equivalently Crataegus grignonensis) was published in 1890 on the basis of a description written by Pierre Mouillefert,[2] who was the professor of sylviculture at l'École nationale d'Agriculture de Grignon.