Juncus effusus

from WordNet (r) 3.0 (2006)

Juncus effusus
    n 1: 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}, {Juncus effusus}]

from The Collaborative International Dictionary of English v.0.48

Bulrush \Bul"rush`\ (b[.u]l"r[u^]sh`), 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.
   [1913 Webster]

   Note: The name bulrush is applied in England especially to
         the cat-tail ({Typha latifolia} and {Typha
         angustifolia}) and to the lake club-rush ({Scirpus
         lacustris}); in America, to the {Juncus effusus}, and
         also to species of {Scirpus} or club-rush.
         [1913 Webster]