Invasive Species Photo Gallery
Non-Native Plant Species

Inclusion in the list does not imply any legal restrictions for these plants. However, these plants and some of their cultivars have the potential to invade wild areas, outcompete native species, and degrade habitats. Some species may even cause extensive ecological damage.

Click on a thumbnail to view photos available for that plant species, or view these plant species sorted by common name.

See also native plant species.

Photo of Amur Maple by Elizabeth J. Czarapata.

Acer ginnala

Photo of Norway Maple by  Kearns2.

Acer platanoides

Photo of Bishop's Goutweed by Elizabeth J. Czarapata.

Aegopodium podagraria

Photo of Tree-of-heaven by Elizabeth J. Czarapata.

Ailanthus altissima

Photo of Garlic Mustard by  WI DNR.

Alliaria petiolata

Photo of European Black Alder by Elizabeth J. Czarapata.

Alnus glutinosa

Photo of Porcelain Berry by Elizabeth J. Czarapata.

Ampelopsis brevipedunculata

Photo of Wild Chervil by Elizabeth J. Czarapata.

Anthriscus sylvestris

Photo of Common Burdock, Lesser Burdock by Elizabeth J. Czarapata.

Arctium minus

Photo of Leopard Flower by  WI DNR.

Belamcanda chinensis

Photo of Japanese Barberry by Elizabeth J. Czarapata.

Berberis thunbergii

Photo of European Barberry by Elizabeth J. Czarapata.

Berberis vulgaris

Photo of Hoary Alyssum by Elizabeth J. Czarapata.

Berteroa incana

Photo of Hungarian Brome, Smooth Brome by Elizabeth J. Czarapata.

Bromus inermis

Photo of Cheat Grass, Downy Brome by Elizabeth J. Czarapata.

Bromus tectorum

Photo of Flowering Rush by  WI DNR.

Butomus umbellatus

Photo of Creeping Bellflower by Elizabeth J. Czarapata.

Campanula rapunculoides

Photo of Hemp, Marijuana by  WI DNR.

Cannabis sativa

Photo of Siberian Pea Shrub by Elizabeth J. Czarapata.

Caragana arborescens

Photo of Plumeless Thistle, Spiny Plumeless Thistle by Elizabeth J. Czarapata.

Carduus acanthoides

Photo of Musk Thistle by Elizabeth J. Czarapata.

Carduus nutans

Photo of Round-leaved Bittersweet by  WI DNR.

Celastrus orbiculatus

Photo of Spotted Knapweed by Elizabeth J. Czarapata.

Centaurea biebersteinii

Photo of Russian Knapweed by  WI DNR.

Centaurea repens

Photo of Celandine by Elizabeth J. Czarapata.

Chelidonium majus

Photo of Ox-eye Daisy by Elizabeth J. Czarapata.

Chrysanthemum leucanthemum

Photo of Blue-sailors, Chicory by Elizabeth J. Czarapata.

Cichorium intybus

Photo of Canada Thistle, Creeping Thistle, Field Thistle by Elizabeth J. Czarapata.

Cirsium arvense

Photo of European Marsh Thistle by Steve Garske.

Cirsium palustre

Photo of Bull Thistle by Elizabeth J. Czarapata.

Cirsium vulgare

Photo of Poison Hemlock by  WI DNR.

Conium maculatum

Photo of Lily-of-the-valley by Elizabeth J. Czarapata.

Convallaria majalis

Photo of Field Bindweed by Elizabeth J. Czarapata.

Convolvulus arvensis

Photo of Crown-vetch, Purple Crown-vetch by Elizabeth J. Czarapata.

Coronilla varia

Photo of Hawk's Beard by  WI DNR.

Crepis tectorum

Photo of Common Hound's Tongue by  WI DNR.

Cynoglossum officinale

Photo of Orchard Grass by Elizabeth J. Czarapata.

Dactylis glomerata

Photo of Queen Anne's Lace by Elizabeth J. Czarapata.

Daucus carota

Photo of Grecian Foxglove by  WI DNR.

Digitalis lanata

Photo of Chinese Yam by Elizabeth J. Czarapata.

Dioscorea sp.

Photo of Common Teasel, Wild Teasel by Elizabeth J. Czarapata.

Dipsacus fullonum subsp. Sylvestris

Photo of Cut-leaved Teasel by  WI DNR.

Dipsacus laciniatus

Photo of Russian Olive by  WI DNR.

Elaeagnus angustifolia

Photo of Autumn Olive by Elizabeth J. Czarapata.

Elaeagnus umbellata

Photo of Quack Grass by Elizabeth J. Czarapata.

Elytrigia repens

Photo of Hairy Willow Herb by Elizabeth J. Czarapata.

Epilobium hirsutum

Photo of Helleborine, Helleborine Orchid by Elizabeth J. Czarapata.

Epipactis helleborine

Photo of Wintercreeper by  WI DNR.

Euonymous fortunei

Photo of Burning Bush by Elizabeth J. Czarapata.

Euonymus alatus

Photo of Cypress Spurge, Graveyard Spurge by Elizabeth J. Czarapata.

Euphorbia cyparissias

Photo of Leafy Spurge, Wolf's-milk by Elizabeth J. Czarapata.

Euphorbia esula var. esula

Photo of Tall Fescue by Elizabeth J. Czarapata.

Festuca arundinacea

Photo of Queen-of-the-meadow by  WI DNR.

Filipendula ulmaria

Photo of Quick-weed by  WI DNR.

Galinsoga quadriradiata

Photo of Creeping-charlie, Gill-over-the-ground, Ground-ivy by Elizabeth J. Czarapata.

Glechoma hederacea

Photo of Baby's-breath Common Baby's-breath by Elizabeth J. Czarapata.

Gypsophila paniculata

Photo of English Ivy by Elizabeth J. Czarapata.

Hedera helix

Photo of Orange Day Lily by Elizabeth J. Czarapata.

Hemerocallis fulva

Photo of Giant Hogweed by Steve Kenyon.

Heracleum mantegazzianum

Photo of Dame's Rocket by Elizabeth J. Czarapata.

Hesperis matronalis

Photo of Orange Hawkweed by Elizabeth J. Czarapata.

Hieracium aurantiacum

Photo of Yellow Hawkweed by Elizabeth J. Czarapata.

Hieracium piloselloides

Photo of Tall Hawkweed by  WI DNR.

Hieracium sp.

Photo of Japanese Hops by David Eagan.

Humulus japonicus

Photo of Hydrilla by Kathy Hamel.

Hydrilla verticillata

Photo of European Frogbit by Erich  Haber.

Hydrocharis morsus-ranae

Photo of Common St. Johns-wort by Elizabeth J. Czarapata.

Hypericum perforatum

Photo of Balfour's Touch-me-not by  WI DNR.

Impatiens balfourii

Photo of Yellow Water Flag by  WI DNR.

Iris pseudacorus

Photo of Nipplewort by  WI DNR.

Lapsana communis

Photo of Everlasting Pea by  WI DNR.

Lathyrus latifolia

Photo of Tuberous Sweet Pea by  WI DNR.

Lathyrus tuberosus

Photo of Silky Bush Clover by  WI DNR.

Lespedeza cuneata

Photo of Common Privet by Elizabeth J. Czarapata.

Ligustrum vulgare

Photo of Butter-and-eggs by Elizabeth J. Czarapata.

Linaria vulgaris

Photo of Japanese Honeysuckle by Elizabeth J. Czarapata.

Lonicera japonica

Photo of Amur Honeysuckle by  WI DNR.

Lonicera maacki

Photo of Honeysuckle by Elizabeth J. Czarapata.

Lonicera spp.

Photo of Tartarian Honeysuckle by  WI DNR.

Lonicera tatarica

Photo of Morrow's Honeysuckle by  WI DNR.

Lonicera tatarica

Photo of Bell's Honeysuckle by  WI DNR.

Lonicera x bella

Photo of Bird's-foot Deer-vetch, Bird's-foot Trefoil by Elizabeth J. Czarapata.

Lotus corniculata

Photo of Moneywort by Elizabeth J. Czarapata.

Lysimachia nummularia

Photo of Purple Loosestrife, Spiked Loosestrife by Elizabeth J. Czarapata.

Lythrum salicaria

Photo of White Sweet-clover by Elizabeth J. Czarapata.

Melilotus alba

Photo of Yellow Sweet-clover by Elizabeth J. Czarapata.

Melilotus officinalis

Photo of Spearmint by Elizabeth J. Czarapata.

Mentha spicata

Photo of Japanese Stilt Grass by Elizabeth J. Czarapata.

Microstegium vimineum

Photo of Pampas Grass by  WI DNR.

Miscanthus sinensis

Photo of White Mulberry by Elizabeth J. Czarapata.

Morus alba

Photo of Aquatic Forget-me-not by Elizabeth J. Czarapata.

Myosotis scorpioides

Photo of Garden Forget-me-not by Elizabeth J. Czarapata.

Myosotis sylvatica

Photo of Eurasian Water Milfoil by Elizabeth J. Czarapata.

Myriophyllum spicatum

Photo of Watercress by Elizabeth J. Czarapata.

Nasturtium officinale

Photo of Star-of-bethlehem by  WI DNR.

Ornithogalum umbellatum

Photo of Wild Parsnip by Elizabeth J. Czarapata.

Pastinaca sativa

Photo of Reed Canary Grass by Elizabeth J. Czarapata.

Phalaris arundinacea

Photo of Common Reed Grass by Elizabeth J. Czarapata.

Phragmites australis

Photo of Scotch Pine by Elizabeth J. Czarapata.

Pinus sylvestris

Photo of Canada Bluegrass, Wiregrass by Elizabeth J. Czarapata.

Poa compressa

Photo of Kentucky Bluegrass by Elizabeth J. Czarapata.

Poa pratensis

Photo of Black Bindweed by Elizabeth J. Czarapata.

Polygonum convolvulus

Photo of Japanese Knotweed, Mexican Bamboo by Elizabeth J. Czarapata.

Polygonum cuspidatum

Photo of Mile-a-minute by Elizabeth J. Czarapata.

Polygonum perfoliatum

Photo of Giant Knotweed by  WI DNR.

Polygonum sacchilense

Photo of White Poplar by Elizabeth J. Czarapata.

Populus alba

Photo of Curled Pondweed, Curly Pondweed by Elizabeth J. Czarapata.

Potamogeton crispus

Photo of Kudzu by Elizabeth J. Czarapata.

Pueraria spp.

Photo of Lesser Celandine by Elizabeth J. Czarapata.

Ranunculus ficaria

Photo of Common Buckthorn, European Buckthorn by Elizabeth J. Czarapata.

Rhamnus cathartica

Photo of European Alder Buckthorn, Glossy Buckthorn by Elizabeth J. Czarapata.

Rhamnus frangula

Photo of Black Jet-bead by  WI DNR.

Rhodotypos scandens

Photo of Black Locust by Elizabeth J. Czarapata.

Robinia pseudoacacia

Photo of Multiflora Rose by Elizabeth J. Czarapata.

Rosa multiflora ex Murray

Photo of Wineberry by John Randall.

Rubus phoenicolasius

Photo of Field Sorrel by Elizabeth J. Czarapata.

Rumex acetosella

Photo of Curly Dock by  WI DNR.

Rumex crispus

Photo of Bouncing Bet by Elizabeth J. Czarapata.

Saponaria officinalis

Photo of Yellow Sedum by  WI DNR.

Sedum acre

Photo of White Campion by Elizabeth J. Czarapata.

Silene latifolia

Photo of Bladder-campion by  WI DNR.

Silene vulgaris

Photo of Deadly Nightshade by Elizabeth J. Czarapata.

Solanum dulcamara

Photo of European Mountain Ash by Elizabeth J. Czarapata.

Sorbus acuparia

Photo of Johnson Grass by Elizabeth J. Czarapata.

Sorghum halepense

Photo of Common Comfrey by  WI DNR.

Symphytum officinale

Photo of Common Tansy by Elizabeth J. Czarapata.

Tanacetum vulgare

Photo of Field Hedge Parsley by Elizabeth J. Czarapata.

Torilis arvensis

Photo of Japanese Hedge Parsley by  WI DNR.

Torilis japonica

Photo of Water Chestnut by  WI DNR.

Trapa natans

Photo of Red Clover by Elizabeth J. Czarapata.

Trifolium pratense

Photo of White Clover by Elizabeth J. Czarapata.

Trifolium repens

Photo of Narrow-leaved Cattail by Elizabeth J. Czarapata.

Typha angustifolia

Photo of Hybrid Cattail by Elizabeth J. Czarapata.

Typha x glauca

Photo of Chinese Elm by  WI DNR.

Ulmus parviflora

Photo of Siberian Elm by Elizabeth J. Czarapata.

Ulmus pumila

Photo of Garden Heliotrope by Elizabeth J. Czarapata.

Valeriana officinalis

Photo of Common Mullein by Elizabeth J. Czarapata.

Verbascum thaspus

Photo of Wayfaring Tree by Elizabeth J. Czarapata.

Viburum lantana

Photo of Periwinkle by Elizabeth J. Czarapata.

Vinca minor

Photo of Black Swallow-wort by  WI DNR.

Vincetoxicum nigrum

Photo of Dog-strangling Vine by  WI DNR.

Vincetoxicum rossicum

Photo of Sweet Violet by  WI DNR.

Viola odorata

Last Revised: March 14, 2008