Cirsium palustre (L.) Scop.
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Authority
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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Family
Asteraceae
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Scientific Name
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Description
Species Description - Biennial 3–20 dm, the stem spiny-winged by the decurrent lf-bases; herbage ± arachnoid; heads purple, several or many, clustered, seldom any of the peduncles over 1 cm; invol 1–2 cm, its bracts not at all spine-tipped; mature pappus 1 cm or less; achenes 3 mm; 2n=34. Native of Eurasia, now widely intr. in ne. U.S. and se. Can., often invading woods and seemingly native. June, July.
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Common Names
marsh-thistle