Robert W. Freckmann Herbarium


Because of technology changes and personnel changes at UWSP and the Wisconsin State Herbarium, the database of plant species housed at this site was merged with the database from the OLD WisFlora website to create a new Flora of Wisconsin website at Currently we are encouraging all Wisplant viewers to begin using the Flora of Wisconsin website as soon as possible. Wisplants will remain operational through July 13th. After that date, all traffic to Wisplants will be redirected to the Flora of Wisconsin website.

Please direct any comments to

Thank you.

  Cirsium arvense (L.) Scop. image
Photographer: Merel R. Black           

Botanical Illustration

Botanical Illustration

Botanical Illustration

Kurt Stüber

Matthew L. Wagner

Christopher Noll

Paul Drobot

Paul Drobot

Paul Drobot

Robert Bierman

Stephen L. Solheim

Stephen L. Solheim
Family Asteraceae
Cirsium arvense (L.) Scop.
Canada thistle, creeping thistle, field thistle
Cirsium: derived from the Greek kirsion, "a kind of thistle;" also cirsos meaning "a swollen vein" for which thistle was once a remedy
arvense: of planted fields
  Restricted Invasive - Eradicate!  Stop It symbol- click for definition
County distribution map- click for detailed distribution maps.
Detailed Distribution:
Town Range Maps
Google Dot Maps
Status: Introduced - naturalized; ecologically invasive and noxious weed
Plant: erect, perennial, 1'-4' tall, spiny forb with deep, colony-forming, creeping roots
Flower: head 1/2" wide with pink disk flowers; inflorescence of many heads in usually flat-topped clusters; blooms June-Oct.
Fruit:dry seed on fluffy, feathery-divided pappus
Leaf:usually pinnately-divided, more or less whitish below
Habitat: disturbed sites, fields

More Information Natural Communities Herbarium Specimens
All Cirsium list Ethnobotany Information Google- Images or Text

Flora of North America (off site)
Carduus arvensis (L.) Robson
Cirsium arvense (L.) Scop. f. albiflorum (E.L.Rand & Redfield) Ralph Hoffm.
Cirsium arvense (L.) Scop. var. argenteum (Vest) Fiori
Cirsium arvense (L.) Scop. var. horridum Wimm. & Grab.
Cirsium arvense (L.) Scop. var. integrifolium Wimm. & Grab.
Cirsium arvense (L.) Scop. var. mite Wimm. & Grab.
Cirsium arvense (L.) Scop. var. vestitum Wimm. & Grab.
Cirsium incanum (Gmel.) Fisch.
Cirsium setosum (Willd.) Besser ex M.Bieb.
Cnicus arvensis (L.) Roth
Cnicus arvensis (L.) Roth f. albiflorum E.L.Rand & Redfield
Serratula arvensis L.

Botany News/Events
Book We Recommend
Historical Botanists
Other Links
Botanical Club of Wisconsin (off site)
UW-Stevens Point Biology Dept.
Plants of Wisconsin
Vascular Plants
Natural Communities
Botany News/Events
Other Links
Lichens (off site)   
Tom Volk's Fungi (off site)
Taxonomy of Vascular Plants
                          Vascular Plants
Browse by Identification Guides
Family Wildflowers
Genus Trees
Common Names Shrubs
Search by Vines
Names Aquatic-Semi aquatic
Specimens Ferns - Fern Allies
Blooming Times Grasses, Sedges, or Rushes
County & Status Other Resources  
Town Range Taxonomy of Vascular Plants
  WI Checklist & CofC Values
Browse by:
Common Name
Search by:
Copyright © 2012 Permissions Contact Us Web Map