The Collaborative International Dictionary of English v.0.48:

Xanthorhoea \Xan`tho*rhoe"a\, n. [NL., from Gr. xanqo`s yellow +
   "rei^n to flow.] (Bot.)
   A genus of endogenous plants, native to Australia, having a
   thick, sometimes arborescent, stem, and long grasslike
   leaves. See Grass tree.
   [1913 Webster]