This annual or biennial weed is widely distributed across the U.S.A. and southern Canada, but it is largely absent from warmer regions of southeastern states (K). There are clusters of records within the Bluegrass region of Ky. and the Central basin of Tenn., presumably reflecting an association with eutrophic pastures and barnyards (with much NPK). In Ky. it became established early after settlement. Short (1928-29) noted: "An exotic originally, now so thoroughly naturalized as to be met with every where in cultivated grounds and neglected wastes." The species has a long history of medicinal uses (with antioxidant phenolics and flavonoids) and culinary uses across its original range (Makowski & Morrison 1989, Khalid & Saleem 2018), but it is indeed generally neglected within North America.