The Collaborative International Dictionary of English v.0.48:

Ranunculaceous \Ra*nun`cu*la"ceous\
   (r[.a]*n[u^][ng]`k[-u]*l[=a]"sh[u^]s), a. [See Ranunculus.]
   (Bot.)
   Of or pertaining to a natural order of plants
   (Ranunculaceae), of which the buttercup is the type, and
   which includes also the virgin's bower, the monkshood,
   larkspur, anemone, meadow rue, and peony.
   [1913 Webster]