Blue Lotus (or blue Egyptian lotus), Blue Water lily (or blue Egyptian water lily), Sacred Blue Lily (or sacred narcotic lily of the nile) Nymphaea Caerulea

Wikipedia : http://en.wikipedia.org/wiki/Nymphaea_caerulea

"Nymphaea Caerula" by PalmBeaches974 - Own work. Licensed under CC BY-SA 3.0 via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:Nymphaea_Caerula.jpg#mediaviewer/File:Nymphaea_Caerula.jpg; 

Image Source : https://medicineroom.net/2012/09/blue-lotus-as-medicine-nymphaea-caerulea/