CRAIG K. LORENZ / SCIENCE PHOTO LIBRARY CRAIG K. LORENZ / SCIENCE PHOTO LIBRARY
Mexican Gold Poppies (Eschscholzia mexicana) are winter annuals that grow in profusion with good fall and winter rain in the Sonoran Desert. A giant saguaro cactus is seen in the background (Carnegiea gigantea) Organ Pipe National Monument, AZ.
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