Source : Webster's Revised Unabridged Dictionary (1913)

Polemoniaceous \Pol`e*mo`ni*a"ceous\, a. (Bot.)
   Of or pertaining to a natural order of plants
   ({Polemoniace[ae]}), which includes {Polemonium}, {Phlox},
   {Gilia}, and a few other genera.

Source : WordNet®

polemoniaceous
     adj : of or pertaining to or characteristic of plants of the
           family Polemoniaceae