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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...

[An article has not been written yet.]

Cirsium arvense (Canada thistle)

7/18/2020 · Woodward Point Preserve, Brunswick, Maine · ≈ 4 × 6″ (10 × 15 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 · ≈ 7 × 4½″ (18 × 12 cm)

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 · ≈ 4½ × 3″ (11 × 7.9 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 · ≈ 6 × 3½″ (14 × 9.4 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 · ≈ 6 × 4″ (15 × 10 cm)

Cirsium arvense (Canada thistle)

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

Cirsium arvense (Canada thistle)

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

Range:

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