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.
SYNONYMOUS WITH Flora of North America north of Mexico, vol. 19-20-21 (2006)
SYNONYMOUS WITH VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 179-25-013:
Carduus arvensis FAMILY Asteraceae__
SYNONYMOUS WITH Manual of the Southeastern Flora (Small, 1933, 1938)
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 (Smith, 1998).
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 (Horn, Cathcart, Hemmerly, & Duhl, 2005).
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org bug_5451379
Pappus tawny, plumose, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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 (Smith, 1998).
COMPARE involucral bracts of Thistles
Flora of North America north of Mexico, vol. 19-20-21
Manual of the Southeastern Flora (Small, 1933, 1938)
Habitat: Pastures, disturbed areas, per Weakley's Flora
Uncommon in NC Mountains, rare or waifs elsewhere in GA-NC-SC
CLICK HERE to see a map, notes, and images from Weakley's Flora of the Southeastern US.
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 (Kaufman & Kaufman, 2007) p301
- Newcomb's Wildflower Guide (Newcomb, 1977) p430
- Wildflowers of the Atlantic Southeast (Cotterman, Waitt, & Weakley, 2019) p393
- Wildflowers in the Field and Forest: Northeastern US (Clemants & Gracie, 2006) p024
- Wildflowers of Tennessee (Carman, 2005) p285
- Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005) p334
- Wildflowers of the Southern Mountains (Smith, 1998) p184
If a search such as "Carex leptalea var. leptalea" doesn't deliver the results you want, try "Carex leptalea".
Or, to minimize chances of a misspelling, try just "Carex le".
Less is more: If "pencil flower" doesn't deliver the results you want, try "pencil".