Two Ky. colls. have been tentatively assigned to this northeastern species: made in BELL (KY) and POWE (MICH). I. versicolor is considered to be an allopolyploid (2n = 108) derived from I. shrevei Small and the more Arctic northeastern taxon, I. hookeri Penny (= I. setosa var. canadensis; Cr, FNA 26). Further investigation is needed. This species, known as "blue flag", has had much traditional use in medicine, and related species such as shrevei may have been often substituted (Hocking 1935). However, there has been little recent research into the chemistry underlying these uses. I. versicolor contains an isoflavone "iridin" that can cause dermatitis in humans, but it may have medicinal applications (Ying et al. 2021).,