The Collaborative International Dictionary of English v.0.48:
Polypetalous \Pol`y*pet"al*ous\, a. [Poly- + petal.] (Bot.) Consisting of, or having, several or many separate petals; as, a polypetalous corolla, flower, or plant. --Martyn. [1913 Webster]WordNet (r) 3.0 (2006):
polypetalous adj 1: having a corolla composed of many separated or distinct petals