Eliezer_Yudkowsky comments on Group selection update - Less Wrong
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Thus demonstrating that a sort of species selection can exist, because species can't breed with each other and therefore can't be infected by SC genes from other species, while group selection can't exist, SC always infects.
In orchids (at least), not only between-species, but between-genus breeding has place. And species like Epipactis helleborine have flexible approach to SC/SI.