If defined (as here) to include the segregate genus Seriphidium, a genus of about 400-500 species, shrubs and herbs, north temperate, boreal, and arctic. Jiao et al. (2023) proposed the recognition of eight subgenera, of which seven are present in our regional flora of native and naturalized species.
Ref: Arriagada & Miller (1997); Björk (2021); Cronquist (1980); Jiao et al. (2023); Mosyakin, Boiko, & Glukhova (2019); Schultz (2006) In Flora of North America Editorial Committee (2006a); Verloove (2013); Verloove & Andeweg (2020); Verloove et al. (2020); Verloove, Mosyakin, & Boiko (2021); Yeou-Ruenn (1995). Show full citations.