As circumscribed here (excluding Metanarthecium, following Fuse, Lee, & Tamura 2012), a genus of about 30 species, of e. North America and e. Asia.
ID notes: A distinctive genus, with a basal rosette of yellowish-green, lanceolate leaves with sharply pointed tips, and a nearly leafless flowering stalk with numerous, small, white or yellow flowers
Ref: Fuse, Lee, & Tamura (2012); Spaulding et al. (2021); Sullivan (2002) In Flora of North America Editorial Committee (2002a); Tamura In Kubitzki (1998a); Ward (1978); Weigant (2002); Zomlefer (1997b). Show full citations.