great water crowfoot

from The Collaborative International Dictionary of English v.0.48

Water crowfoot \Wa"ter crow"foot`\ (Bot.)
   An aquatic kind of buttercup ({Ranunculus aquatilis}), used
   as food for cattle in parts of England.
   [1913 Webster]

   {Great water crowfoot}, an American water plant ({Ranunculus
      multifidus}), having deep yellow flowers.
      [1913 Webster]