Bromus japonicus Thunb. (syn.: B. patulus Mert. et W.D.J. Koch) (SE-Eur., SW-As.) – A more or less frequent but always ephemeral alien. Probably first collected in 1862 in Aalst. Formerly chiefly introduced with wool, nowadays usually associated with grain importation. Seen most years in port areas, near granaries, under grain conveyors, along road verges and railway tracks or on dumps, sometimes in abundance.