The Collaborative International Dictionary of English v.0.48:

Rutaceous \Ru*ta"ceous\, a. [L. rutaceous, from ruta rue. See
   Rue the plant.] (Bot.)
   Of or pertaining to plants of a natural order (Rutaceae) of
   which the rue is the type, and which includes also the
   orange, lemon, dittany, and buchu.
   [1913 Webster]