Cirsium flodmanii (Rydb.) Arthur
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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 - Resembling no. 10 [Cirsium undulatum (Nutt.) Spreng.], but smaller and more delicate, 3–8 dm, and vigorously spreading by short-lived creeping roots, the individual plants thus established generally becoming taprooted; lvs usually rather deeply pinnatifid, the lobes commonly lance-triangular and seldom over 7 mm wide, or sometimes fully as wide as those of no. 10, varying to subentire and merely spiny-margined (especially the basal ones); heads merely rounded (not invaginated) at the base, and avg smaller, the invol 2–2.5(–3) cm, its bracts appearing darker, narrower, more numerous, and more closely imbricate, their spine-tips sometimes under 3 mm; fls rich purple (white); achenes 3–5 mm, with a conspicuous apical yellow band; 2n=22. Swales and other moderately moist, poorly drained sites on the Great Plains, extending e. to Man., Minn., and Io., and occasionally intr. eastward. June–Sept. (C. canescens, misapplied)
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Common Names
prairie thistle