This annual is widespread across northern states and adjacent Canada, but uncommon to rare further south (K, W). The history of distributonal records suggests that inavasin may have stalled, and that decline may have occured (Luken et al. 1993; K). For Ky., there is a verified coll. from a railroad yard of KENT (KNK). Reported colls. from along railroads in HARD (MUR) and ROWA (Carr & Cohn 1941) need to be checked.