water hyacinth

from WordNet (r) 3.0 (2006)

water hyacinth
    n 1: a tropical floating aquatic plant having spikes of large
         blue flowers; troublesome in clogging waterways especially
         in southern United States [syn: {water hyacinth}, {water
         orchid}, {Eichhornia crassipes}, {Eichhornia spesiosa}]

from The Collaborative International Dictionary of English v.0.48

Water hyacinth \Wa"ter hy"a*cinth\ (Bot.)
   Either of several tropical aquatic plants of the genus
   {Eichhornia}, related to the pickerel weed.
   [1913 Webster]

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