polygenetic

a. 1. Having many distinct sources; originating at various places or times. [ 1913 Webster ]

2. (Biol.) Of or pertaining to polygenesis; polyphyletic. [ 1913 Webster ]

Polygenetic mountain range (Geol.), one which is composite, or consists of two or more monogenetic ranges, each having had its own history of development. Dana. [ 1913 Webster ]