Crataegus phaenopyrum

Crataegus phaenopyrum

Crataegus phaenopyrum (L. f.) Medik.
Engl.: Washington hawthorn, Washington-thorn.
Deu.: Washington-Weißdorn.
Bot. syn.: Crataegus cordata Ait., Crataegus populifolia Walt., Crataegus youngii Sarg.

I have no articles for this botanical term, but there might be some for the next level down (if found).