The Collaborative International Dictionary of English v.0.48:

deer's-ear \deer's-ear\ n.
   any of various tall perennial herbs constituting the genus
   Frasera; it is widely distributed in warm dry upland areas
   of the US Pacific states.

   Syn: columbo, American columbo, deer's-ears, pyramid plant,
        American gentian.
        [WordNet 1.5]