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Oregon-grape, Berberis aquifolium  or Mahonia aquifolium is a shrub whose classification is in dispute, generally considered as Mahonia. Recently, this classification has been supported by their rusts. Originally, the Oregon Holly Grape (Mahonia aquifolium) is from the Pacific Northwest of United States of America. Cultivated in Europe, and bird dispersed has became a weed, not restricted to gardens
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- ↑ "Berberis aquifolium in Flora of North America @ efloras.org". www.efloras.org.
- ↑ McCain JW, & JF Hennen 1982 Is the Taxonomy of Berberis and Mahonia (Berberidaceae) Supported by Their Rust Pathogens Cumminsiella santa sp. nov. and Other Cumminsiella Species (Uredinales)? Systematic Botany, 7. 48-59
- ↑ "New illegal aliens - Helmholtz-Centre for Environmental Research". www.ufz.de.