1.NounA grouping of genetically related organisms that may or may not be morphologically similar and are recognized by systematists as being in different species or subspecies and may even belong to different genera. (Can we verify this sense?)
2.NounA suite of partially interfertile species that exchange genes, either directly or indirectly, under certain evolutionary and biogeographic conditions, and where interspecific gene flow is episodic and spatially variable in nature.