Weedy and aggressive plant species native to Wisconsin

The list is organized by species within growth forms.
C = Coefficient of Conservatism, LH = Life History, A = Annual, B = Biennial, P = Perennial, W.I.S. = Wetland Indicator Status.
Categories: F=Forbs and Herbaceous Vines, G=Grass-like and Sedge-like Monocots, S=Shrubs, T=Trees

Habitat information obtained from the University of Wisconsin – Stevens Point, Robert W. Freckmann Herbarium website (http://wisplants.uwsp.edu/VascularPlants.html) when available.

CategoryGenusSpeciesCommonNameCLHW.I.S.Habitat
FAcalypharhomboideathree-seeded-mercury0AFACUfull to part sun; dry to moist; woods, disturbed sites, gardens
TAcernegundobox elder0PFACW-moist; rich soil
TAcersaccharinumsilver maple2PFACWmoist to wet; often on riverbanks
FAchilleamillefoliumcommon yarrow, milfoil1PFACUwide variety of disturbed sites
FAgrimoniagryposepalacommon agrimony2PFACU+partial sun; dry to moist; woods, forests
FAlliumcanadensewild onion4PFACUdry, moderate moisture, to wet; open woods, prairies
SAlnusincanaspeckled alder4POBLmoist to wet; streambanks, lakeshores, bogs, swamps, swales and roadsides
FAmaranthusretroflexuscommon amaranth, pigweed0AFACU+disturbed sites
FAmaranthustuberculatusrough-fruited amaranth3AOBLmoist; usually ditches and shores
FAmaranthusalbuswhite amaranth0AFACUdisturbed sites
FAmbrosiaartemisiifoliacommon ragweed0AFACUdisturbed sites
FAmbrosiatrifidagiant ragweed0AFAC+moist; disturbed sites
FAmbrosiapsilostachyaperennial ragweed2PFAC-dry; prairies, disturbed sites; in sandy soil
GAndropogongerardiibig bluestem4PFAC-full sun; dry, moderate moisture, to wet; prairies; in sandy, loamy soil
FAnemonecanadensisCanada anemone4PFACWfull to partial sun; wet to moderate moisture; meadows, prairies, shores; in sandy, loamy soil
FApocynumandrosaemifoliumspreading dogbane2PUplupland woods
FArabislyratalyrate rock-cress4B/PFACU-dry; woods, fields, rocks; in rocky, sandy soil
FAsclepiassyriacacommon milkweed1PUplfull to partial sun; dry to wet; meadows, fields, prairies; in sandy, loamy soil
FAsclepiasverticillatawhorled milkweed2PUpldry; prairies, fields, roadsides, woods; in sandy soil; spreading northward
FAstersagittifoliusarrow-leaved aster3PUplpartial sun to shade; dry to moderate moisture; woods, disturbed sites, streambanks; in sandy, loamy soil
FAsterlaterifloruscalico aster3PFACW-full to partial sun; dry to moderate moisture; fields, clearings, shores; in sandy, loamy, clayey soil
FAsterpilosusfrost aster1PFACU+full sun; dry; prairies, disturbed sites; in sandy, gravelly soil
FAsterericoidesheath aster4PFACU-full sun; dry to moderate moisture; meadows, prairies; in sandy, loamy soil
FAsternovae-angliaeNew England aster3PFACWfull to partial sun; moderate moisture to moist; meadows, prairies; in sandy, loamy soil
FAsterlanceolatuswhite panicle aster4PNIpartial sun to shade; moist; low areas, woods
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