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Cirsium P. Miller. Thistle.

Key to Cirsium

A genus of about 250 species, herbs, north temperate.

Key adapted in part from Cronquist (1980); portions of key based on Keil (2006f).

Ref: Cronquist (1980); Keil (2006f) In Flora of North America Editorial Committee (2006a); Nesom (2021i); Nesom (2022a). Show full citations.

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image of plant© John Gwaltney | Cirsium arvense | Original Image ⭷
image of plant© Floyd A. Griffith | Cirsium altissimum | Original Image ⭷
image of plant© Gary P. Fleming | Cirsium pumilum | Original Image ⭷
image of plant© Bruce A. Sorrie | Cirsium repandum | Original Image ⭷


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