Robert W. Freckmann Herbarium
University of Wisconsin - Stevens Point

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Wisconsin's Potentially New Invasive Plants

The Wisconsin Department of Natural Resources and the Wisconsin State Herbarium have announced a new initiative.
Wisconsin Invasive Plants Reporting and Prevention Project
Prevent the spread of plants known to be newly invasive in Wisconsin or in nearby states.
Identify these population and control or destroy them before they can spread.
We hope the information presented here will assist in this effort.

Invasive Plants of the Future

image of common teasel    

Invasive Plants Targeted
Upland
Aquatic / Wetland
You Can Help
Collecting & Reporting Guidelines (new window)
Invasive Plant Report Form (pdf -Adobe® Reader®) (new window)

Upland (all links open new window), [WI] = already in Wisconsin

Wisconsin detail page OR Google Information Search Google Image Search Click for interactive detail map
Common Teasel  (Dipsacus fullonum subsp. sylvestris) [WI]  image of common teasel Wis. distribution map
Cut-leaved Teasel  (Dipsacus laciniatus) [WI] image of cut-leaved teasel Wis. distribution map
Giant Hogweed  (Heracleum mantegazzianum) image of giant hogweed National distribution map
Japanese Hops  (Humulus japonicus)   [WI]  image of Japanese hops Wis. distribution map
Japanese Stilt Grass  (Microstegium vimineum) image of Japanese stilt grass National distribution map
Wineberry or Wine Raspberry  (Rubus phoenicolasius) image of wineberry National distribution map
Japanese Hedge Parsley  (Torilis japonica) [WI] image of Japanese hedge parsley Wis. distribution map
Spreading Hedge Parsley  (Torilis arvensis) image of spreading hedge parsley National distribution map
Black Swallow-wort  (Vincetoxicum nigrum) [WI] image of black swallow-wort Wis. distribution map
Pale Swallow-wort  (Cynanchum rossicum) image of pale swallow-wort National distribution map

 

Aquatic / Wetland  (all links open new window)

Click for Wisconsin detail page OR Google Information Search (offsite) Google Image Search (offsite) Click for interactive detail map
Flowering Rush (Butomus umbellatus) [WI] image of flowering rush Wis. distribution map
European Marsh Thistle  (Cirsium palustre) [WI] image of European marsh thistle Wis. distribution map
Hydrilla   (Hydrilla verticillata) image of hydrilla National distribution map
European Frog-Bit  (Hydrocharis morsus-ranae) image of European frog-bit National distribution map
Water Chestnut  (Trapa natans) image of water chestnut National distribution map

You Can Help

If you suspect that you have found one of these plants;

  1. Collect a good specimen (fresh or pressed) and/or take photos, and report its location as precisely as you can.
           See Collecting & Reporting Guidelines
(new window)
  2. Fill out a Reporting Form  (new window)  (pdf -Adobe® Reader®).  Send your information to the Wisconsin State Herbarium, WIS-DNR, Freckmann Herbarium, or any other qualified institution.
  3. Contact person: Courtney LeClair

If you are certain of the identification, make your report then destroy the population or at least prevent plants from producing fruits or seeds. As with most invasives, the residue seeds from years before will probably remain so the site will need to be checked in subsequent years. Contact a local land manager or the project coordinator if you need assistance to control the population,.  Be sure you report your findings and actions so a record can be keep track of all these invasives.   

For information

Wisconsin Invasive Species (new window)

Wisconsin Invasive Plants Reporting & Prevention Project

  Courtney LeClair
  Invasive Plant Education, Early Detection, and Mapping Specialist
  WI Department of Natural Resources
  101 S. Webster St.
  Madison, WI 53707-7921
  Phone: (608) 267-7438
  Website:
http://dnr.wi.gov/invasives/futureplants/reporting.htm (new window)

Vascular Plants

Plants of Wisconsin

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