Numerous plants have been introduced to Oregon, and many of them have become invasive species. The following are some of these species:
| class=unsortable | Picture | Scientific Name | Common 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 |