Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Campanulids: Asterales
Dig deeper at SERNEC, a consortium of southeastern herbaria.
Check out EDDMapS.org to see where this has been reported.
Read more about Canada Thistle at Vascular Plants of North Carolina.
Canada Thistle, Field Thistle
To see larger pictures, click or hover over the thumbnails.
JK Marlow jkm060712_059
July Tazewell County VA
Numerous small heads (0.5"-0.75") in a branched inflorescence, per Wildflowers of the Southern Mountains.
Bruce Ackley, The Ohio State University, Bugwood.org bug_5436742
Lower leaf surfaces are green, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org bug_5451379
Pappus tawny, plumose, per Vascular Flora of the Carolinas.
Rob Routledge, Sault College, Bugwood.org bug_5515718
Involucres are smooth or, at most, have minute prickles on outer bracts, per Wildflowers of the Southern Mountains.
COMPARE involucral bracts of Thistles
Habitat: Pastures, disturbed areas, per Weakley's Flora
NEW! Click here to see a map from Weakley's Flora of the Southeastern US showing range and abundance.
Click here to see a map showing all occurrences known to SERNEC, a consortium of southeastern herbaria. (Zoom in to see more detail.)
This plant is causing problems in natural areas outside its native range, according to authorities such as:
- Alabama Invasive Plant Council, 2012
- Kentucky Exotic Pest Plant Council, 2013
- SC Exotic Pest Plant Council, 2014
- Tennessee Exotic Pest Plant Council, 2009
- Virginia Department of Conservation and Recreation, 2014
IS THE PLANT "ARMED"?
Leaf margins spiny
Simple: Lobed, unlobed and/or dissected
TO LEARN MORE about this plant, look it up in a good book!
- Invasive Plants, Guide to Identification, Impacts and Control p301
- Newcomb's Wildflower Guide p430
- Wildflowers of the Atlantic Southeast p393
- Wildflowers in the Field and Forest p024
- Wildflowers of Tennessee p285
- Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians p334
- Wildflowers of the Southern Mountains p184