FoI
Swamp Lily   
Foto info
Swamp Lily
P Naturalized Herb elliptic
Photo: Prashant Awale
Common name: Swamp Lily
Botanical name: Ottelia ovalifolia    Family: Hydrocharitaceae (Tape Grass family)

Earlier misidentified.....
Now identified as Mexican Sword-Plant.

Photographed at Veermata Jeejabai Bhosale Udyan, Mumbai.