Jack Dykinga / Sunset Crater National Monument with dawn light on the San Francisco Peaks over fields of flowering Prairie sunflowers (Helianthus petiolaris) Arizona

Jack Dykinga / Sunflower flower (Helianthus petiolaris) at Sunset Crater National Monument, Arizona

Jack Dykinga / Prairie sunflowers (Helianthus petiolaris) catching the sunlight on a sand dune in deep morning shadow. Great Sand Dunes National Monument, Colorado, USA

Jack Dykinga / Prairie Sunflowers (Helianthus petiolaris) flowering on the dunes amid blue morning shadows, Great Sand Dunes National Monument, Colorado, USA.

Doug Wechsler / Prairie sunflowers (Helianthus petiolaris). Canyonlands National Park, Utah, USA. June

Jim Brandenburg / Sunflower (Helianthus petiolaris) closely related to Common Sunflower, South Dakota

Jim Brandenburg / Sunflower (Helianthus petiolaris) closely related to the Common Sunflower, South Dakota