The Genus Berberis
formerly the Genus Mahonia
Holly-leaf Oregon Grape, Shining Oregon Grape, Tall Oregon Grape: Berberis aquifolium (Synonyms: Berberis aquifolium var. aquifolium, Berberis nutkana, Mahonia aquifolium, Odostemon aquifolium) - Shrubs from 150-300 cm high with leaves bearing 5-9 leaflets. The leaflets average more than twice as long as wide. The leaflet margins bear 12-29 prominent spiny teeth. Lower leaf surfaces lack minute papillae as viewed with a 15X lens.
Cascade Oregon Grape, Cascade Oregon-grape, Dull Oregongrape, Long-leaved Oregon Grape: Berberis nervosa (Synonyms: Berberis nervosa var. mendocinensis, Mahonia nervosa, Mahonia nervosa var. mendocinensis, Mahonia nervosa var. nervosa, Odostemon nervosus) - Shrubs up to 60 cm high with leaves bearing 9-19 leaflets.
Creeping Oregon Grape, Low Oregon Grape: Berberis repens (Synonyms: berberis aquifolium var. repens, Berberis nana, Berberis sonnei, Mahonia repens, Mahonia sonnei, Odostemon repens) - Shrubs 15-80 cm high with leaves bearing 5-7 leaflets. The leaflets average less than twice as long as wide. The leaflet margins bear 15-43 inconspicuous spiny teeth. Lower leaf surfaces are covered with minute papillae as viewed with a 15X lens.