The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster]WordNet (r) 3.0 (2006):
polemoniaceous adj 1: of or pertaining to or characteristic of plants of the family Polemoniaceae