This Eurasian diploid has been reported from Ky. by Anderson (1924), Mohlenbrock et al. (1966) and others, but the only verified colls. may be from KENT (KNK). Although widely scattered in North America (FNA 24), arvensis does not seem to be increasing in the Ohio Valley. It is relatively tall (often 80-110 cm), with large panicles (ca. 10-30 cm), and large anthers (2.5-5 mm versus 0.7-3 mm); lower leaf sheaths have distinctive soft appressed hairs. It is easily confused with japonicus, racemosus or other species, and all records deserve checking; see detailed key in FNA 24.