A genus of about 8 species, perennial herbs, of North America. Steironema has occasionally been accorded genus rank in eastern North American floras (notably Small 1933, Gleason & Cronquist 1952, and Mohlenbrock 2014), but has more usually been included in Lysimachia. The morphologic differences from Lysimachia are more profound than the superficially similar flowers suggest. Yan et al. (2018) shows Steironema and Trientalis in a clade basal to Centunculus, Anagallis, and Lysimachia (in a narrower sense). We prefer to recognize these traditional and monophyletic clades at generic rank. Hab: A genus of X species, perennial herbs, of temperate and boreal North America.
Ref: Cholewa (2009f) In Flora of North America Editorial Committee (2009); Estes, Shaw, & Mausert-Mooney (2015); Gleason & Cronquist (1952); Mohlenbrock (2014); Weakley & Poindexter (2022) In Weakley et al. (2022); Yan et al. (2018). Show full citations.