spatterdock
noun
spat·ter·dock ˈspa-tər-ˌdäk 
: any of a genus (Nuphar) of water lilies having usually cordate leaves and typically yellow flowers
Example Sentences
Recent Examples on the Web The rain darkened the way, which heightened colors, like the lavender of pickerelweed blossoms and brilliant yellow of spatterdock flowers. 
Kevin Spear, OrlandoSentinel.com, 1 June 2018
Kevin Spear, OrlandoSentinel.com, 1 June 2018 Word History
First Known Use
1813, in the meaning defined above