This cosmopolitan malodorous annual of barnyards and similar sites has probably been present in Ky. since early after settlement (Short et al. 1833). In the central Bluegrass, Short (1828-9) noted: "The road sides and waste grounds are every where covered with this obtrusive weed, which, originally introduced, has become quite too well known among us." Rafinesque (1836, 1:31) even expressed uncertainty about its naturalized versus native status in North America. Some colls. need to be rechecked for arvensis, which has been confused.