Glaucium flavum (yellow hornpoppy or yellow horned poppy) is a summer flowering plant in the Papaveraceae family, which is native to Northern Africa, Macaronesia, temperate zones in Western Asia and the Caucasus, as well as Europe. Habitat: the plant grows on the seashore and is never found inland. All parts of the plant, including the seeds, are toxic and can produce a range of symptoms up to and including respiratory failure resulting in death FDA poisonous plants database. It is a noxious weed in some areas of North America, where it is an introduced species. The thick, leathery deeply segmented, wavy, bluish-grey leaves are coated in a layer of water retaining wax. The sepal, petals and stamen have a similar structure and form to the Red Poppy (Papaver rhoeas) except the sepals are not hairy. Prolific quantities of seeds are held in a distinctive horn shaped fruit some 15 to 30 cm in length, which is divided into two chambers.