The Collaborative International Dictionary of English v.0.48:

Oregon grape \Or"e*gon grape`\ ([o^]r"[-e]*g[o^]n gr[=a]p`).
   (Bot.)
   An evergreen species of barberry (Berberis Aquifolium), of
   Oregon and California; also, its roundish, blue-black
   berries.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

mahonia \ma*ho"ni*a\, n. [Named after Bernard McMahon.] (Bot.)
   The Oregon grape, a species of barberry (Berberis
   Aquifolium), often cultivated for its hollylike foliage.
   [1913 Webster]