Hornemann's willowherb
- kingdom: Plantae
- phylum: Tracheophyta
- class: Magnoliopsida
- order: Myrtales
- family: Onagraceae
- genus: Epilobium
- species: Epilobium hornemannii
- Fermont
- Havre-Saint-Pierre
Quebec
Canada- Narsaq
Kujalleq
Greenland- Dutch Harbor
- Juneau
- Sitka
- Unalaska
Alaska- Bigfork
Montana- Union
Oregon- Logan
- North Logan
Utah- Ahtanum
Washington
United States