Cirsium hillii (Canby) Fernald
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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 - Much like no. 4 [Cirsium pumilum (Nutt.) Spreng], but perennial with long, thickened roots, these traversed longitudinally by several cavities; glutinous dorsal ridge of the invol bracts avg larger and better developed; achenes mostly 4–5 mm; 2n=30. Prairies and other open places, often in sandy soil; s. Ont. to Pa., w. to Minn. and S.D. June–Aug.