I saw a plant with large flowers in Southern California a couple of weeks ago, both in the wild in a mountainous area between Murrieta (near San Diego) and San Clemente and in a garden belonging to Mission San Juan Capistrano. It looked like a giant poppy, and I had planned to post some photos here for identification. In the meanwhile I found the name of the plant in a book, so it is no longer a mystery to me, but I am showing it anyhow, since it was quite striking, with many large (around 15 cm), fragrant, white flowers, the whole plant was more than 1 m (said to be up to 2.4 m) tall, gray-green pinnately divided leaves. The name? Matilija Poppy (Romneya coulteri).