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A primrose blooms in this McCullough Mountains wash near an old tree trunk The wash continues to wind its way down from the McCullough MountainsThumbnailsThe star of most every desert-wilderness trip: the stray balloonThe wash continues to wind its way down from the McCullough MountainsThumbnailsThe star of most every desert-wilderness trip: the stray balloonThe wash continues to wind its way down from the McCullough MountainsThumbnailsThe star of most every desert-wilderness trip: the stray balloonThe wash continues to wind its way down from the McCullough MountainsThumbnailsThe star of most every desert-wilderness trip: the stray balloonThe wash continues to wind its way down from the McCullough MountainsThumbnailsThe star of most every desert-wilderness trip: the stray balloon

This is probably Oenothera caespitosa.