WordNet (r) 3.0 (2006):

bullrush
    n 1: tall marsh plant with cylindrical seed heads that explode
         when mature shedding large quantities of down; its long
         flat leaves are used for making mats and chair seats; of
         North America, Europe, Asia and North Africa [syn:
         cat's-tail, bullrush, bulrush, nailrod, reed
         mace, reedmace, Typha latifolia]
    2: 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]