The botanical family of Lotus is

The botanical family of Lotus is Nymphaceae.
Nymphaeaceae is a family of flowering plants, commonly called water lilies. They live as rhizomatous aquatic herbs in temperate and tropical climates around the world.
Lotus is one of two extant species of aquatic plant in the family Nelumbonaceae. It is sometimes colloquially called a water lily, though this more often refers to members of the family Nymphaeaceae.
Lotus plants are adapted to grow in the flood plains of slow-moving rivers and delta areas.