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Cichorium intybus
Very nice spotting! Occasionally Chicory will have white flowers. Most of the time it is blue or purplish.
Here is another picture of a white chicory flower:
http://wiseacre-gardens.com/wordpress/wh...
For comparison, if you scroll down to see the white Azalia, the flower shape is different:
http://www.cuhk.edu.hk/greencampus/en/fa...