fanwort

from WordNet (r) 3.0 (2006)

fanwort
    n 1: common aquatic plant of eastern North America having
         floating and submerged leaves and white yellow-spotted
         flowers [syn: {water-shield}, {fanwort}, {Cabomba
         caroliniana}]

from The Collaborative International Dictionary of English v.0.48

fanwort \fanwort\ n.
   a common aquatic plant ({Cabomba caroliniana}) of eastern
   North America having floating and submerged leaves and white
   yellow-spotted flowers.

   Syn: water-shield, {Cabomba caroliniana}.
        [WordNet 1.5]