The Collaborative International Dictionary of English v.0.48:

Santalaceous \San`ta*la"ceous\, a. (Bot.)
   Of or pertaining to a natural order of plants
   (Santalaceae), of which the genus Santalum is the type,
   and which includes the buffalo nut and a few other North
   American plants, and many peculiar plants of the southern
   hemisphere.
   [1913 Webster]