As redefined, a monotypic genus of se. North America. A molecular systematics study by Zomlefer et al. (2001) gives strong support to a treatment recognizing Zigadenus as monotypic (Zigadenus glaberrimus), Anticlea (including for our area the former Zigadenus elegans ssp. glaucus), Stenanthium (including for our area Stenanthium spp. and the former Zigadenus densus and Z. leimanthoides). Zigadenus (as redefined) has a chromosome number of 2n=54 (Zomlefer, McKain, & Rentsch 2014), unique in the family.
Ref: Schwartz (2002) In Flora of North America Editorial Committee (2002a); Tamura In Kubitzki (1998a); Zomlefer (1997a); Zomlefer et al. (2001); Zomlefer, McKain, & Rentsch (2014). Show full citations.