''Physematium oreganum'', the Oregon cliff fern, is a perennial fern in the family

Woodsiaceae ''Woodsia'' is a genus of ferns in the order Polypodiales. In the Pteridophyte Phylogeny Group classification of 2016 (PPG I), it is the only genus in the family Woodsiaceae, placed in the suborder Aspleniineae. The family can also be treat ...

. This plant is native to a large part of the western and northern

United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...

and

Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...

.USDA PLANTS Profile for ''W. oregana''
/ref>

References

External links

Jepson Manual TreatmentFlora of North AmericaWashington Burke MuseumPhoto gallery
oreganum Ferns of the United States Flora of the Western United States Flora of Canada {{Polypodiales-stub