juncus effusus(n = noun.plant) bullrush, bulrush, common rush, soft rush - tall rush with soft erect or arching stems found in Eurasia, Australia, New Zealand, and common in North America;
is a kind of rush
is a member of genus juncus, juncus

genus juncus, juncus, juncus articulatus, juncus bufonius, juncus inflexus, juncus leseurii, juncus tenuis