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Photograph of Oenothera hartwegii subsp. hartwegii.
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Photograph of Oenothera hartwegii subsp. hartwegii.
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Sonoran Desert Museum grounds, Tucson, Arizona
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Sonoran Desert Museum grounds, Tucson, Arizona,
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New Mexico, United States
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Sonoran Desert Museum grounds, Tucson, Arizona, April 3, 2010
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New Mexico, United States