资料来源 : Webster's Revised Unabridged Dictionary (1913)

Bulrush \Bul"rush`\, n. [OE. bulrysche, bolroysche; of uncertain
   origin, perh. fr. bole stem + rush.] (Bot.)
   A kind of large rush, growing in wet land or in water.

   Note: The name bulrush is applied in England especially to
         the cat-tail ({Typha latifolia} and {T. angustifolia})
         and to the lake club-rush ({Scirpus lacustris}); in
         America, to the {Juncus effusus}, and also to species
         of {Scirpus} or club-rush.

资料来源 : WordNet®

Juncus effusus
     n : tall rush with soft erect or arching stems found in Eurasia,
         Australia, New Zealand, and common in North America [syn:
          {bulrush}, {bullrush}, {common rush}, {soft rush}]