Robert W. Freckmann Herbarium


  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
(Glossary)

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

Flora of North America (off site)
Synonyms 
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.

         
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