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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 to see what it means. Data for arrows not developed for genera and families which may have species only occurring outside the flora area.

image of plant© Keith Bradley | Cirsium altissimum | Original Image ⭷
image of plant© John Gwaltney | Cirsium arvense | Original Image ⭷
image of plant© Floyd A. Griffith | Cirsium altissimum | Original Image ⭷
image of plant© Scott Ward | Cirsium muticum | Original Image ⭷
image of plant© Sonnia Hill | Cirsium engelmannii | Original Image ⭷
image of plant© Gary P. Fleming | Cirsium pumilum | Original Image ⭷
image of plant© Bruce A. Sorrie | Cirsium repandum | Original Image ⭷
image of plant© Gary P. Fleming | Cirsium virginianum | Original Image ⭷
image of plant© Scott Ward | Cirsium muticum | Original Image ⭷
image of plant© J.W. Hardin | Cirsium vulgare | Original Image ⭷
image of plant© Scott Ward | Cirsium carolinianum | Original Image ⭷