blackthorn hawthorn
- kingdom: Plantae
- phylum: Tracheophyta
- class: Magnoliopsida
- order: Rosales
- family: Rosaceae
- genus: Crataegus
- species: Crataegus calpodendron
Montréal
Quebec
Canada
Smoke Rise
Alabama- Jamaica Plain
Massachusetts- Arlington
Virginia- Washington, D. C.
Washington, D.C.- Milwaukee
Wisconsin
United States