Jack Dykinga / Sunflower flower (Helianthus petiolaris) at Sunset Crater National Monument, Arizona
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Jack Dykinga / Prairie sunflowers (Helianthus petiolaris) catching the sunlight on a sand dune in deep morning shadow. Great Sand Dunes National Monument, Colorado, USA
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Jim Brandenburg / Monarch (Danaus plexippus) butterfly group resting on Giant Sunflower (Helianthus giganteus) during migration, Iowa
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Jack Dykinga / Prairie Sunflowers (Helianthus petiolaris) flowering on the dunes amid blue morning shadows, Great Sand Dunes National Monument, Colorado, USA.
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Doug Wechsler / Prairie sunflowers (Helianthus petiolaris). Canyonlands National Park, Utah, USA. June
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Shattil & Rozinski / Alpine sunflower {Rydbergia grandiflora} flowering in the spring on alpine tundra, Rocky Mountain NP, Colorado, USA, 2004
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Shattil & Rozinski / Alpine sunflower {Rydbergia grandiflora} flowering on alpine tundra, Rocky Mountain NP, Colorado, USA, 1999
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Shattil & Rozinski / Alpine sunflower {Rydbergia grandiflora} flowering in the spring on alpine tundra, Rocky Mountain NP, Colorado, USA, 2004
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Jim Brandenburg / Sunflower (Helianthus petiolaris) closely related to Common Sunflower, South Dakota
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Jim Brandenburg / Sunflower (Helianthus petiolaris) closely related to the Common Sunflower, South Dakota
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Jim Brandenburg / Monarch (Danaus plexippus) butterfly feeding on a Giant Sunflower (Helianthus giganteus), South Dakota
