In Ky. this diploid (2n = 18) is known only from the Ohio Rv. shores in BOON (A. Cusick #24687 at NCU) and JEFF (JC coll. in 2020), plus a waif on the Univ. of Ky. campus in FAYE (KY). Variation needs further study across ranges. Plants in northeastern North America can mostly be treated as var. glaucum, which apparently originated from Eurasia; they are rare to absent in southeastern states (FNA 4). Var. salinum (Standl.) Boivin, which has been treated as a species by some authors (with more leafy inflorescences, more acute leaves, and larger seeds), may be native in western and northern regions, but it is virtually unknown in states east of the Mississippi Rv. (FNA 4, W).