Cirsium flodmanii (Rydb.) Arthur
Family: Asteraceae
Flodman's thistle,  more...
[Carduus flodmanii Rydb.,  more]
Cirsium flodmanii image
Emmet J. Judziewicz  
Etymology: Flodmanii = named for J.H. Flodman who discovered the plant.
Plants
: erect, perennial, 12"-32" tall forb spread by creeping roots which become taproots on the new plants; usually a single stem covered with dense, whitish fuzz
Leaves
: usually deeply pinnately-divided with long triangular lobes, underside with whitish fuzz
Flowers
: head 1" wide with a rounded base and purple disk flowers; inflorescence with one to a few clustered heads; blooms June-Sept.
Fruits
: dry seed with a yellow band on fluffy, feathery-divided pappus
Habitat
: moist; poorly-drained areas mostly along railroads
Conservation Status
: Introduced - adventive
Slender woolly-stemmed perennial 3-6 (-9) dm tall, spreading prolifically by root sprouts. Leaves lanceolate, densely permanently white-woolly beneath, less so and often glabrate above, subentire to deeply undulate-pinnatifid (then very spiny), the lobes narrowly lanceolate to triangular, usually less than 7 mm wide at the base (rarely wider in rosette leaves), ending in firm yellow spines. Heads with bright purple corollas, the involucre 2-2.7 cm high, the narrow bracts to 2.5 mm wide, glutinous-ridged and fiocculose, the outer abruptly contracted, the apical spines divergent, the inner acuminate. Achenes 2.5-3.5 mm long, light brown with a distinct yellow apical band more than 1/2 mm wide.

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.

Native of the Great Plains, recently introduced in Wisconsin on sandy roadsides, along railroads, and disturbed areas, and rarely established in native prairie [Shinne rs 1173, Dane Co. (WIS)]. Flowering from late June to early October; fruiting from August through October. This species is very similar to the more robust C. undulatum. A careful analysis of their differences may be found in Frankton and Moore (1961).

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 flodmanii image
Emmet J. Judziewicz  
Cirsium flodmanii image
Derek Anderson  
Cirsium flodmanii image
Cirsium flodmanii image
Cirsium flodmanii image
Cirsium flodmanii image
Cirsium flodmanii image
Cirsium flodmanii image
Cirsium flodmanii image
Cirsium flodmanii image
Cirsium flodmanii image
Cirsium flodmanii image
Cirsium flodmanii image
Cirsium flodmanii image
Cirsium flodmanii image
Cirsium flodmanii image
Cirsium flodmanii image
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