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Cirsium arvense (L.) Scop.

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 (Canada thistle)

7/18/2020 · Woodward Point Preserve, Brunswick, Maine
≈ 9 × 6" (21 × 16 cm)

Cirsium arvense (Canada thistle)

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

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.

 

Cirsium arvense description by Thomas H. Kent, last updated 23 Sep 2021.

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Cirsium arvense (Canada thistle)

7/17/2021 · Wilbur Preserve, Cox’s Head, Phippsburg, Maine
≈ 4½ × 3½" (12 × 9.0 cm)

Cirsium arvense (Canada thistle)

7/17/2021 · Wilbur Preserve, Cox’s Head, Phippsburg, Maine
≈ 6 × 3½" (14 × 9.4 cm)

Cirsium arvense (Canada thistle)

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

Cirsium arvense (Canada thistle)

7/17/2021 · Wilbur Preserve, Cox’s Head, Phippsburg, Maine
≈ 4½ × 3½" (12 × 9.2 cm)

Cirsium arvense (Canada thistle)

7/2/2010 · Stansbury Mill Rd, Phoenix, Mary­land
≈ 6 × 9" (14 × 22 cm)

Range:

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