This widespread variable weed originates from the Mediterranean region, and it has become widespread across westernn states (K, FNA 24). It has also become locally established in coastal regions across southern states, especially on waste ground (Cr, FNA 24). However, it remains virtually unknown in northeastern states, especially the Ohio Valley (K). The only Ky. coll. is from a greenhouse in BOUR during 1979 (KNK; M, J).