The Matilija (ma-TILL-uh-hah) Poppy, often called the Fried Egg poppy, has the largest flower of any native California species, 6+ inches (15+ cm) across. It’s native to dry, sunny areas from California to Baja. These ones were growing by Serrano Road and had probably escaped from a garden, as I don’t see them growing natively in this part of the SM Mountains. But it’s always such a treat to come across them.