IPAW’s Plant List

IPAW’s Working List of Invasive Plants of Wisconsin

Scientific Name Common Name Obs Mean Impact Mean Dist Level Growth Form WIS Habitats Invaded More Info
Acer platanoides Norway maple 15 3.75 10.1785 Tree Forest Info
Alliaria petiolata Garlic Mustard 44 9.375 12.5595 Forb Fac Forest Info
Arctium minus Common burdock 38 3.2638 6.3888 Forb Forest, Grassland Info
Berberis thunbergii Japanese barberry 29 3.75 10.7142 Shrub FacU- Forest, Grassland Info
Bromus inermis Smooth brome 36 6.4705 9.9285 Grass Grassland, Barrens Info
Campanula rapunculoides Creeping bellflower 11 3.6363 5.6818 Forb Forest, Grassland Info
Celastrus orbiculatus Oriental bittersweet 14 6.25 9.423 Vine Forest Info
Centaurea maculosa Spotted knapweed 44 7.5 6.4285 Forb Grassland, Barrens Info
Cirsium arvense Canada thistle 44 6.25 6.5625 Forb FacU Grassland, Barrens Info
Convallaria majalis Lily-of-the-valley 13 5.7692 10.2083 Forb Forest Info
Convolvulus arvensis Field bindweed 24 2.2727 5.0 Forb, Vine Grassland Info
Cornilla varia Crown vetch 37 7.9166 7.6428 Forb, Vine Grassland Info
Crepis tectorum Cheat grass 13 3.8636 5.0 Forb Grassland, Barrens Info
Daucus carota Queen Annes lace 38 3.7857 6.9117 Forb Grassland Info
Dipsacus laciniatus Cut-leaved teasel 15 7.0 6.7857 Forb Grassland, Wetland Info
Dipsacus sylvestris Common teasel 18 5.8333 5.9722 Forb Grassland Info
Elaeagnus angustifolia Russian olive 15 4.2307 8.125 Tree, Shrub FacU- Grassland Info
Elaeagnus umbellata Autumn olive 19 6.6666 8.3333 Shrub Grassland, Forest Info
Elytrigia repens Quackgrass 30 5.6034 7.3214 Grass Grassland Info
Epipactis helleborine Helleborine orchid 12 2.5 11.75 Forb Forest Info
Euphorbia cyparissias Cypress spurge 18 5.4166 8.3333 Forb Grassland, Barrens Info
Euphorbia esula Leafy spurge 29 8.2692 8.4615 Forb Grassland, Barrens Info
Festuca arundinacea Tall fescue 10 5.625 8.0555 Grass Grassland Info
Glechoma hederacea Creeping Charlie 19 3.8235 7.5 Forb FacU Forest, Grassland Info
Hemerocallis fulva Orange daylily 13 5.0 7.2727 Forb Grassland Info
Hesperis matronalis Dame’s rocket 33 5.8593 8.5483 Forb Forest, Grassland Info
Hieracium aurantiacum Orange hawkweed 28 4.4444 9.7222 Forb Grassland, Barrens Info
Hieracium caespitosum Yellow hawkweed 11 4.0 8.5 Forb Grassland, Barrens Info
Hypericum perforatum St. John’s wort 32 2.3333 7.9464 Forb Grassland, Barrens Info
Iris pseudacorus Yellow iris 15 3.5714 8.75 Forb Obl Wetland, Aquatic Info
Leonurus cardiaca Motherwort 19 2.5 5.9722 Forb Forest Info
Lonicera maackii Amur honeysuckle 13 8.3333 10.8333 Shrub Forest, Grassland Info
Lonicera morrowii Morrow’s honeysuckle 21 8.375 11.5789 Shrub Forest, Grassland Info
Loricera tatarica Tartarian honeysuckle 33 8.5156 11.0156 Shrub FacU Forest, Grassland Info
Lonicera x bella Bell’s honeysuckle 14 8.9285 12.3214 Shrub Forest, Grassland Info
Lotus corniculatus Bird’s-foot trefoil 32 4.7656 5.4687 Forb Fac- Grassland Info
Lysimachia nummularia Moneywort 12 5.6818 10.625 Forb FacW+ Wetland, Forest Info
Lythrum salicaria Purple loosestrife 45 9.3181 11.6279 Forb Obl Wetland, Aquatic Info
Melilotus alba White sweet clover 41 6.9078 9.5394 Forb FacU Grassland, Barrens Info
Melilotus officinalis Yellow sweet clover 41 6.6025 9.5394 Forb FacU Grassland, Barrens Info
Morus alba White mulberry 15 2.8333 8.1666 Tree Fac Forest, Grassland Info
Myosotis scorpioides Forget-me-not 17 4.375 8.75 Forb Obl Wetland, Forest Info
Myriophyllum spicatum Eurasian watermilfoil 25 9.2708 11.7391 Forb Obl Aquatic Info
Pastinaca sativa Wild parsnip 40 6.625 8.9473 Forb Grassland Info
Phalaris arundinacea (nn) Reed canary grass (nn) 47 9.8936 11.6489 Grass FacW+ Wetland, Grassland Info
Phragmites australis (nn) Common reed grass (nn) 16 8.4375 9.2187 Grass FacW+ Wetland Info
Pinus sylvestris Scotch pine 13 2.6923 9.1666 Tree Forest, Grassland Info
Poa compressa Canada bluegrass 23 2.5 10.5681 Grass FacU+ Grassland, Barrens Info
Poa pratensis Kentucky bluegrass 34 4.7656 10.0 Grass Fac- Grassland, Barrens Info
Polygonum cuspidatum Japanese knotweed 17 7.6562 5.1562 Forb FacU Forest, Grassland Info
Populus alba White poplar 10 5.5 8.5 Tree Grassland Info
Potamogeton crispus Curly-leaf pondweed 18 5.3333 12.5 Forb Obl Aquatic Info
Rhamnus cathartica Common buckthorn 40 9.2763 12.0394 Shrub, Tree FacU Forest, Grassland, Wetland Info
Rhamnus frangula Glossy buckthorn 25 8.9583 12.7083 Shrub Fac+ Wetland, Forest Info
Robinia pseudoacacia Black locust 33 7.5 10.9375 Tree FacU- Grassland, Forest Info
Rosa multiflora Multiflora rose 27 6.5384 10.4166 Shrub FacU Grassland, Forest Info
Rumex acetosella Sheep sorrel 21 3.1578 7.7631 Forb Fac Grassland, Barrens Info
Saponaria officinalis Soapwort 19 3.3333 6.3888 Forest FacU Grassland Info
Solanum dulcamara Climbing nightshade 19 3.3333 7.9166 Forb Fac Wetland, Forest Info
Tanacetum vulgare Tansy 22 4.2105 5.125 Forb Grassland, Barrens Info
Trifolium pratense Red clover 29 3.1 6.7307 Forest FacU+ Grassland Info
Trifolium repens White clover 29 2.9 5.673 Forest FacU+ Grassland Info
Typha angustifolia Narrow-leaved cattail 21 7.375 9.125 Forest Obl Wetland, Aquatic Info
Typha x glauca Hybrid cattail 11 7.7272 9.0909 Forest Obl Wetland, Aquatic Info
Ulmus pumila Siberian elm 17 4.8437 7.9687 Tree, Shrub Grassland Info
Vinca minor Common periwinkle 10 6.875 7.5 Forb, Vine Forest Info

Headings and Acronyms Explained

Heading Meaning Description
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 Indicators Explained

Status Code Wetland Type Explanation
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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