See under Egyptian lotus(def 1).
a water lily, Nymphaea stellata, of India, having pale-blue flowers.
Definition for blue lotus (2 of 2)
either of two Egyptian water lilies of the genus Nymphaea, as N. caerulea (blue lotus), having light blue flowers, or N. lotus (white lotus), having white flowers.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for blue lotus
The frame is the blue-lotus pattern, very curiously gilt and chased.