IPAW's Working List of Invasive Plants of Wisconsin

Scientific NameCommon NameObsMean ImpactMean Dist LevelGrowth FormWISHabitats InvadedMore Info
Acer platanoidesNorway maple153.7510.1785Tree ForestInfo
Alliaria petiolataGarlic Mustard449.37512.5595ForbFacForestInfo
Arctium minusCommon burdock383.26386.3888Forb Forest, GrasslandInfo
Berberis thunbergiiJapanese barberry293.7510.7142ShrubFacU-Forest, GrasslandInfo
Bromus inermisSmooth brome366.47059.9285Grass Grassland, BarrensInfo
Campanula rapunculoidesCreeping bellflower113.63635.6818Forb Forest, GrasslandInfo
Celastrus orbiculatusOriental bittersweet146.259.423Vine ForestInfo
Centaurea maculosaSpotted knapweed447.56.4285Forb Grassland, BarrensInfo
Cirsium arvenseCanada thistle446.256.5625ForbFacUGrassland, BarrensInfo
Convallaria majalisLily-of-the-valley135.769210.2083Forb ForestInfo
Convolvulus arvensisField bindweed242.27275.0Forb, Vine GrasslandInfo
Cornilla variaCrown vetch377.91667.6428Forb, Vine GrasslandInfo
Crepis tectorumCheat grass133.86365.0Forb Grassland, BarrensInfo
Daucus carotaQueen Annes lace383.78576.9117Forb GrasslandInfo
Dipsacus laciniatusCut-leaved teasel157.06.7857Forb Grassland, WetlandInfo
Dipsacus sylvestrisCommon teasel185.83335.9722Forb GrasslandInfo
Elaeagnus angustifoliaRussian olive154.23078.125Tree, ShrubFacU-GrasslandInfo
Elaeagnus umbellataAutumn olive196.66668.3333Shrub Grassland, ForestInfo
Elytrigia repensQuackgrass305.60347.3214Grass GrasslandInfo
Epipactis helleborineHelleborine orchid122.511.75Forb ForestInfo
Euphorbia cyparissiasCypress spurge185.41668.3333Forb Grassland, BarrensInfo
Euphorbia esulaLeafy spurge298.26928.4615Forb Grassland, BarrensInfo
Festuca elatiorTall fescue105.6258.0555Grass GrasslandInfo
Glechoma hederaceaCreeping Charlie193.82357.5ForbFacUForest, GrasslandInfo
Hemerocallis fulvaOrange daylily135.07.2727Forb GrasslandInfo
Hesperis matronalisDame's rocket335.85938.5483Forb Forest, GrasslandInfo
Hieracium aurantiacumOrange hawkweed284.44449.7222Forb Grassland, BarrensInfo
Hieracium caespitosumYellow hawkweed114.08.5Forb Grassland, BarrensInfo
Hypericum perforatumSt. John's wort322.33337.9464Forb Grassland, BarrensInfo
Iris pseudacorusYellow iris153.57148.75ForbOblWetland, AquaticInfo
Leonurus cardiacaMotherwort192.55.9722Forb ForestInfo
Lonicera maackiiAmur honeysuckle138.333310.8333Shrub Forest, GrasslandInfo
Lonicera morrowiiMorrow's honeysuckle218.37511.5789Shrub Forest, GrasslandInfo
Loricera tataricaTartarian honeysuckle338.515611.0156ShrubFacUForest, GrasslandInfo
Lonicera x bellaBell's honeysuckle148.928512.3214Shrub Forest, GrasslandInfo
Lotus corniculatusBird's-foot trefoil324.76565.4687ForbFac-GrasslandInfo
Lysimachia nummulariaMoneywort125.681810.625ForbFacW+Wetland, ForestInfo
Lythrum salicariaPurple loosestrife459.318111.6279ForbOblWetland, AquaticInfo
Melilotus albaWhite sweet clover416.90789.5394ForbFacUGrassland, BarrensInfo
Melilotus officinalisYellow sweet clover416.60259.5394ForbFacUGrassland, BarrensInfo
Morus albaWhite mulberry152.83338.1666TreeFacForest, GrasslandInfo
Myosotis scorpioidesForget-me-not174.3758.75ForbOblWetland, ForestInfo
Myriophyllum spicatumEurasian watermilfoil259.270811.7391ForbOblAquaticInfo
Pastinaca sativaWild parsnip406.6258.9473Forb GrasslandInfo
Phalaris arundinacea (nn)Reed canary grass (nn)479.893611.6489GrassFacW+Wetland, GrasslandInfo
Phragmites australis (nn)Common reed grass (nn)168.43759.2187GrassFacW+WetlandInfo
Pinus sylvestrisScotch pine132.69239.1666Tree Forest, GrasslandInfo
Poa compressaCanada bluegrass232.510.5681GrassFacU+Grassland, BarrensInfo
Poa pratensisKentucky bluegrass344.765610.0GrassFac-Grassland, BarrensInfo
Polygonum cuspidatumJapanese knotweed177.65625.1562ForbFacUForest, GrasslandInfo
Populus albaWhite poplar105.58.5Tree GrasslandInfo
Potamogeton crispusCurly-leaf pondweed185.333312.5ForbOblAquaticInfo
Rhamnus catharticaCommon buckthorn409.276312.0394Shrub, TreeFacUForest, Grassland, WetlandInfo
Rhamnus frangulaGlossy buckthorn258.958312.7083ShrubFac+Wetland, ForestInfo
Robinia pseudoacaciaBlack locust337.510.9375TreeFacU-Grassland, ForestInfo
Rosa multifloraMultiflora rose276.538410.4166ShrubFacUGrassland, ForestInfo
Rumex acetosellaSheep sorrel213.15787.7631ForbFacGrassland, BarrensInfo
Saponaria officinalisSoapwort193.33336.3888ForestFacUGrasslandInfo
Solanum dulcamaraClimbing nightshade193.33337.9166ForbFacWetland, ForestInfo
Tanacetum vulgareTansy224.21055.125Forb Grassland, BarrensInfo
Trifolium pratenseRed clover293.16.7307ForestFacU+GrasslandInfo
Trifolium repensWhite clover292.95.673ForestFacU+GrasslandInfo
Typha angustifoliaNarrow-leaved cattail217.3759.125ForestOblWetland, AquaticInfo
Typha x glaucaHybrid cattail117.72729.0909ForestOblWetland, AquaticInfo
Ulmus pumilaSiberian elm174.84377.9687Tree, Shrub GrasslandInfo
Vinca minorCommon periwinkle106.8757.5Forb, Vine ForestInfo

Headings and Acronyms Explained

Heading Meaning
Obs Observations The number of survey respondents.
 Mean Impact Mean Impact The average scores for the variables.
     0 = Little or no ecological impact
    10 = Invades and replaces native communities
Mean Dist Level Mean Disturbance Level The average scores for the variables.
    0 = Only in sites disturbed within the last 3 years
    20 = In high-quality, undisturbed natural areas 
WIS Wetland Indicator Status Wetland Indicator Status for Region 3 from the "National List of Plant Species that Occur in Wetlands;" plants with no indicators status listed are presumed to be upland, or species that occur >99% of the time in upland habitats.
Habitats Invaded   Taken from the most common responses on the IPAW-GLIFWC survey; almost all species were recorded as also occurring in disturbed habitats (not recorded here).
(nn)   following a species name indicates a non-native strain of a species that also has native strains occurring in Wisconsin.
Wetland Indicator Status Code Wetland Type
OBL Obligate Wetland Occurs almost always (estimated probability 99%) under natural conditions in wetlands.
FACW Facultative Wetland Occurs almost always (estimated probability 67-99%) but occasionally found in non-wetlands.
FAC Facultative  Equally likely to occur in wetlands and non-wetlands (estimated probability 34-66%).
FACU Facultative Upland Usually occurs in non-wetlands (estimated probability 67-99%) but occasionally found on wetlands (estimated probability 1-33%).


A PDF version of this List is available in our newsletter, Issue 4 from March 2003.

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