This diploid (2n = 12) biennial (or short-lived perennial) has a broad northern range, with varied habitats, and includes subspecies in Europe and Asia. Transfer from Arabis to Arabidopsis is supported by recent research (O'Kane & Al-Shehbaz 2003; FNA 7). In Ky. the species has been collected from PIKE: F. Levy (NCU), 19 May 1982, "dry thin soil on rock outcrop outside Pool Pt R.R. bridge near Breaks"; M. Medley #6394 (APSC), 16 Aug 1982, river shore and wooded banks just downstream from mouth of Grassy Creek". There are also records based on unverified colls. from CALL (Woods & Fuller 1989), ESTI (Anderson 1947; check Iowa State Univ.), "knobs" of GRNP (coll. at PH by Riddell fide Short 1840; Hopkins 1937), and "edge of woods near Louisville" in JEFF (Hopkins 1937). A reported coll. from HEND (MUR) appears to be Iodanthus (SERNEC Feb 2020).