Cirsium arvense (Canada thistle)

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Cirsium arvense (L.) Scop.

Canada thistle

Kingdom	Plantae	Plants, but not fungi, lichens, or algae
Subkingdom	Tracheobionta	Vascular plants—plants with a “circulatory system” for delivering water and nutrients
Division	Magnoliophyta	Flowering plants, also known as angiosperms
Class	Magnoliopsida	Dicotyledons—plants with two initial seed leaves
Subclass	Asteridae	A large class that encompasses asters
Order	Asterales	Flowering plants with a central disk flower and surrounding petals, like daisies
Family	Asteraceae	The aster family, which also includes daisies and sunflowers; from the Greek ἀστήρ, “star,” for the star-shaped flowers
Genus	Cirsium	From Greek kirsion, “a kind of thistle”
Species	arvense	Of the fields

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

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

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

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

7/29/2023 · Stansbury Mill Rd, Phoenix, Maryland

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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7/17/2021 · Wilbur Preserve, Cox’s Head, Phippsburg, Maine
≈ 4½ × 3½" (12 × 9 cm)

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

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

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

7/29/2023 · Stansbury Mill Rd, Phoenix, Maryland

7/18/2020 · Woodward Point Preserve, Brunswick, Maine
≈ 4½ × 5" (12 × 13 cm)

Range:

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