dryfj.com / drycyclist.com (kevin cook)

69/79
2054-primrose.jpg 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.