Berberis aquifolium
Common name: 
Oregon Grape
Oregon Grape Holly
Tall Oregon Grape
Pronunciation: 
BER-ber-is a-kwi-FO-lee-um
Family: 
Berberidaceae
Genus: 
Synonyms: 
Mahonia aquifolium
Type: 
Broadleaf
Native to (or naturalized in) Oregon: 
Yes

Berberis aquifolium is the accepted botanical name, but it is often sold in nurseries under its older name, Mahonia aquifolium.

see Mahonia aquifolium

Click image to enlarge