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Cirsium arvense
Canada thistle Aster Family
Cirsium arvense Asteraceae
common names
  Canada thistle
  lettuce from hell thistle
accepted scientific name
  Cirsium arvense (L.) Scop.
rules for finding collection records
  Cirsium arvense (4722)
family name
Image Author: ©2010 Matt Lavin
Image License: CC BY
Image Source
Category: Wildflowers
Flowers: No obvious petals, Many petals
Petal colors: color color
Flower size is about 0.75 inches
Leaf: Alternate
Plant Observed beginning of June thru 2nd week of October
Not Native. Invasive in AZ, CA, CO, CT, DE, ID, IL, IN, IA, KS, KY, MD, MI, MN, MO, NE, NV, NM, NC, ND, OH, OK, PA, SD, UT, WA, WI, WY. Noxious weed in MT, OR.

How Likely at this Location (100%)
Name Match (100%)
Plant Showiness (54%)
base map where plant found
mag select

grid lines base