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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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Hover over a shape, letter, icon, or arrow on the map for definition or see the legend. Data for arrows not developed for genera and families which may have species only occurring outside the flora area.

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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