Waterlily & Cattails is one of Fenton's early opalescent patterns, produced from 1908-1912. At the time the clear/opalescent glass was called Crystal Opalescent. When Fenton reintroduced the color in the 1930's, it was known as French Opalescent.
This is a crimped 7" bowl. The pattern was also produced in Amethyst Opalescent, Blue Opalescent and Green Opalescent.