View source for Cirsium palustre

{{Treatment/ID
|accepted_name=Cirsium palustre
|accepted_authority=(Linnaeus) Scopoli
|publications={{Treatment/Publication
|title=Fl. Carniol. ed.
|place=2, 2: 128. 1772
|year=1772
}}
|common_names=European swamp or marsh thistle;cirse ou chardon des marais
|basionyms={{Treatment/ID/Synonym
|name=Carduus palustris
|authority=Linnaeus
}}
|synonyms=
|hierarchy=Asteraceae;Asteraceae tribe Cardueae;Cirsium;Cirsium palustre
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Asteraceae]]</div><div class="higher-taxon"><small>tribe</small>[[Asteraceae tribe Cardueae]]</div><div class="higher-taxon"><small>genus</small>[[Cirsium]]</div><div class="higher-taxon"><small>species</small>[[Cirsium palustre]]</div></div>
|volume=Volume 19
|mention_page=page 96, 97, 102
|treatment_page=page 110
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Biennials </b>or monocarpic perennials, 30–200(–300) cm; clusters of fibrous roots. <b>Stems</b> single, erect, villous to tomentose with jointed trichomes, distally tomentose with fine, unbranched trichomes; branches 0–few, ascending, (short). <b>Leaves</b>: blades narrowly elliptic to oblanceolate, 15–30+ × 3–10 cm, margins shallowly to very deeply pinnatifid, narrow lobes separated by broad sinuses, spiny-dentate to lobed, main spines 2–6 mm, abaxial villous to tomentose with jointed trichomes, sometimes also thinly tomentose with fine unbranched trichomes, adaxial faces villous with septate trichomes or glabrate; basal often present at flowering, petioles spiny-winged, bases tapered; cauline many, sessile, gradually reduced and becoming widely spaced above, bases long-decurrent with prominently spiny wings; distal cauline deeply pinnatifid with few-toothed spine-tipped lobes. <b>Heads</b> few–many in dense clusters at branch tips. <b>Peduncles</b> 0–1 cm. <b>Involucres</b> ovoid to campanulate, 1–1.5 × 0.8–1.3 cm, thinly cobwebby tomentose with fine unbranched trichomes. <b>Phyllaries</b> in 5–7 series, strongly imbricate, greenish, or with purplish tinge, lanceolate to ovate (outer) or linear-lanceolate (inner), margins thinly arachnoid-ciliate, abaxial faces with narrow glutinous ridge, outer and middle appressed, entire, apices acute, mucronate or spines erect or spreading, weak, 0.3–1 mm; apices of inner phyllaries purplish, linear-attenuate, scarious, flat. <b>Corollas</b> lavender to purple (white), 11–13 mm, tubes 5–7 mm, throats 2–3 mm, lobes 3–4.5 mm; style tips 1.5–2 mm. <b>Cypselae</b> tan to stramineous, 2.5–3.5 mm, apical collars 0.1–0.2 mm, shiny; pappi 9–11 mm. <b>2n</b> = 34.</span><!--

-->{{Treatment/Body
|phenology=Flowering summer (Jul–Aug).
|habitat=Marshes, wet forests
|elevation=10–800 m
|distribution=St. Pierre and Miquelon;B.C.;Nfld. and Labr. (Nfld.);N.S.;Ont.;Que.;Mass.;Mich.;N.H.;N.Y.;Wis.;Europe.
|discussion=<p>Cirsium palustre is a noxious weed, native to Europe, that invasively spreads through wetland communities, forming impenetrable spiny stands as it displaces native species. The range of this pernicious weed in North America is rapidly expanding. It has the potential to spread into boreal forest areas across the continent; in Europe it grows nearly to the Arctic Circle. The rapid spread of C. palustre in Michigan (E. G. Voss 1972–1996, vol. 3) is indicative of its invasiveness. Spontaneous hybrids between C. palustre and C. arvense have been reported from England and other European countries (W. A. Sledge 1975) and can be expected wherever these species grow together in North America.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Cirsium palustre
|author=
|authority=(Linnaeus) Scopoli
|rank=species
|parent rank=genus
|synonyms=
|basionyms=Carduus palustris
|family=Asteraceae
|phenology=Flowering summer (Jul–Aug).
|habitat=Marshes, wet forests
|elevation=10–800 m
|distribution=St. Pierre and Miquelon;B.C.;Nfld. and Labr. (Nfld.);N.S.;Ont.;Que.;Mass.;Mich.;N.H.;N.Y.;Wis.;Europe.
|introduced=true
|reference=None
|publication title=Fl. Carniol. ed.
|publication year=1772
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/coarse_grained_fna_xml/V19-20-21/V19_54.xml
|tribe=Asteraceae tribe Cardueae
|genus=Cirsium
|species=Cirsium palustre
}}<!--

-->[[Category:Treatment]][[Category:Cirsium]]