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Most likely agapanthus aka Nile lily. Even without knowing thee size, I am certain it is not the above suggestions http://en.wikipedia.org/wiki/Agapanthus http://www.google.com/search?q=nile+lily...
could be a Allium caeruleum, or Allium cristophii.
We call it Hyacinth
Lat: 23.92, Long: 120.68
Spotted on Jun 17, 2011 Submitted on Jun 18, 2011