''Papaver rhoeas'' is an annual herbaceous species of flowering plant in the poppy family, Papaveraceae. This poppy is notable as an agricultural weed and after World War I as a symbol of dead soldiers.
Before the advent of herbicides, ''P. rhoeas'' sometimes was abundant in agricultural fields. Although the corn poppy and the California poppy are widely grown in gardens, only ''Papaver somniferum'', the opium poppy, has significant farm production.