xiphidium

from The Collaborative International Dictionary of English v.0.48

Xiphidium \Xi*phid"i*um\, prop. n. [NL., from Gr. ?, dim. of
   xi`fos sword.] (Bot.)
   A genus of plants of the order {Haemodraceae}, having
   two-ranked, sword-shaped leaves.
   [1913 Webster]