Crataegus retrusa
- kingdom: Plantae
- phylum: Tracheophyta
- class: Magnoliopsida
- order: Rosales
- family: Rosaceae
- genus: Crataegus
- species: Crataegus retrusa
Sarnia
Ontario
Canada
Port Huron
Michigan
United States
Crataegus retrusa Sarnia Port Huron