On Yuan Chwang's Travels in India, 629–645 A.D. v2.c20.143

v2.c20.143

Our pilgrim here writes of lotus-flowers of four colours, but commonly only three colours are mentioned; these are the red, white, and blue lotus-flowers, and each of these has a variety of names. But we read of four varieties of lotus-flowers in one tank, and these four are usually represented as the padma (which is red), the utpala (blue), the puṇḍarika and kumuda (which are white).