WordNet (r) 3.0 (2006):

water dragon
    n 1: North American herbaceous perennial of wet places having
         slender curled racemes of small white flowers [syn:
         lizard's-tail, swamp lily, water dragon, Saururus
         cernuus]
    2: swamp plant of Europe and North America having bright yellow
       flowers resembling buttercups [syn: marsh marigold,
       kingcup, meadow bright, May blob, cowslip, water
       dragon, Caltha palustris]