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.
Show in key(s)
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.