Numerous plants have been introduced to Oregon, and many of them have become invasive species. The following are some of these species:
PictureScientific NameCommon Name Ailanthus altissima tree of heaven Ammophila arenaria marram grass Brachypodium sylvaticum false-brome Bromus tectorum drooping brome Buddleja davidii summer lilac Carduus acanthoides spiny plumeless thistle Carduus nutans musk thistle Centaurea cyanus cornflower Cirsium vulgare spear thistle Clematis vitalba old man's beard Cortaderia jubata purple pampas grass Crataegus monogyna common hawthorn Cyperus rotundus coco-grass Cytisus scoparius common broom Cytisus striatus hairy-fruited broom Daphne laureola spurge-laurel Egeria densa large-flowered waterweed Elaeagnus angustifolia Russian olive Euphorbia esula green spurge Euphorbia myrsinites myrtle spurge Fallopia sachalinensis giant knotweed Foeniculum vulgare Florence fennel Genista monspessulana French broom Geranium lucidum shining cranesbill Geranium robertianum herb-Robert Hedera helix common ivy Hedera hibernica Atlantic ivy Ilex aquifolium common holly Impatiens glandulifera impatiens Iris pseudacorus yellow flag Kali tragus prickly Russian thistle Koenigia polystachya Himalayan knotweed Linaria dalmatica Balkan toadflax Linaria vulgaris common toadflax Logfia gallica narrowleaf cottonrose Lythrum salicaria purple loosestrife Phalaris arundinacea reed canary grass Pilosella aurantiaca fox-and-clubs Reynoutria japonica Japanese knotweed Rubus armeniacus Himalayan blackberry Rubus laciniatus cutleaf evergreen blackberry Salix × fragilis crack willow Spartium Spanish broom Tamarix ramosissima saltcedar Torilis arvensis spreading hedgeparsley Ulex gorse
See also Invasive species in the United States
External links USDA PLANTS Database USDA database showing county distribution of plant species in the US InvasiveSpecies.gov Information from the US National Invasive Species Council