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Cirsium arvense (L.) Scop.

Breea arvensis (L.) Less.

Breea incana (S.G. Gmel.) W.A. Weber ined.

Carduus arvensis (L.) Robson

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 (S.G. Gmel.) Fisch. ex M. Bieb.

Cirsium setosum (Willd.) Besser ex M. Bieb.

Serratula arvensis L.

Canada thistle

KingdomPlantaePlants, but not fungi, lichens, or algae
SubkingdomTracheobiontaVascular plants—plants with a “circulatory system” for delivering water and nutrients
DivisionMagnoliophytaFlowering plants, also known as angiosperms
ClassMagnoliopsidaDicotyledons—plants with two initial seed leaves
SubclassAsteridaeA large class that encompasses asters
OrderAsteralesFlowering plants with a central disk flower and surrounding petals, like daisies
FamilyAsteraceaeThe aster family, which also includes daisies and sunflowers; from the Greek ἀστήρ, “star,” for the star-shaped flowers
GenusCirsiumFrom Greek kirsion, “a kind of thistle”
SpeciesarvenseOf the fields

About plant names...

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Cirsium arvense (Canada thistle)

7/18/2020 · Woodward Point Preserve, Brunswick, Maine
≈ 4 × 5" (10 × 13 cm)

Cirsium arvense (Canada thistle)

9/15/1995 · Brier Island, Nova Scotia · By Constance B. Kent

Cirsium arvense (Canada thistle)

7/18/2020 · Woodward Point Preserve, Brunswick, Maine
≈ 5 × 4½" (12 × 12 cm)

Cirsium arvense description by Thomas H. Kent, last updated 21 Aug 2020.

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Cirsium arvense (Canada thistle)

7/18/2020 · Woodward Point Preserve, Brunswick, Maine
≈ 10 × 6" (24 × 16 cm)

Cirsium arvense (Canada thistle)

7/2/2010 · Stansbury Mill Rd, Phoenix, Mary­land
≈ 2 × 2½" (5.7 × 6.1 cm)

Cirsium arvense (Canada thistle)

7/18/2020 · Woodward Point Preserve, Brunswick, Maine
≈ 4½ × 7" (12 × 18 cm)

Cirsium arvense (Canada thistle)

12/29/2020 · Stansbury Mill Rd, Phoenix, Mary­land

Range:

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