Cirsium palustre (L.) Scop.
Family: Asteraceae
European swamp thistle,  more...
[Carduus palustris L.,  more]
Cirsium palustre image
Steve C. Garske  
Etymology: palustre = of marshes
Plants
: erect, biennial, 1' - 6 1/2' tall forb; stems spiny-winged
Flowers
: head 3/4" wide with purple disk flowers, bracts (phyllaries) tips not spiny; inflorescence of usually many clustered heads; blooms June-July
Fruits
: dry seed on fluffy, feathery-divided pappus usually less than 1/3" long
Habitat
: we to moist; woods, roadsides
Invasiveness
: Prohibited/Restricted Invasive - Eradicate!
Conservation Status
: Introduced - naturalized; ecologically invasive
Stout, white-woolly stemmed perennials 3-7 dm tall. Leaves lanceolate to oblanceolate, tomentose beneath, more thinly so above, shallowly lobed to undulate-pinnatifid, the lobes broadly triangular, usually more than 7 mm wide at base, ending in a short, firm spine, the lower midrib conspicuous.Heads solitary to several with pinkpurple corollas; involucre 3-3.5 cm high; bracts 2-4 mm wide, glutinous-ridged, woolly on the margins, the outer obtuse with a flattened broad-based spine, the innermost attenuate int o erose tips. Achenes with very narrow yellow apical band.

Native of the western Great Plains, rarely adventive eastward, in Wisconsin local, very sporadic ... Flowering in June and July; fruiting in August.

Johnson, M.E. and H.H. Iltis. 1963. Preliminary reports on the flora of Wisconsin: No. 48. Compositae Family. Wisconsin Academy of Sciences, Arts & Letters. 52:255-342.

Often confused with Cirsium fiodmanii, but with more shallowly and wider lobed leaves, the middle cauline half-clasping, larger heads, longer florets and anthers, and wider involucral bracts.

Johnson, M.E. and H.H. Iltis. 1963. Preliminary reports on the flora of Wisconsin: No. 48. Compositae Family. Wisconsin Academy of Sciences, Arts & Letters. 52:255-342.

Cirsium palustre image
Steve C. Garske  
Cirsium palustre image
Christopher Noll  
Cirsium palustre image
Emmet J. Judziewicz  
Cirsium palustre image
Steve C. Garske  
Cirsium palustre image
Emmet J. Judziewicz  
Cirsium palustre image
Aaron_Carlson  
Cirsium palustre image
Emmet J. Judziewicz  
Cirsium palustre image
Aaron_Carlson  
Cirsium palustre image
Botanical Illustration  
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
Cirsium palustre image
   View Genus       View Specimen Records