Summary The importance of hybridization in speciation is emphasized by listing most of the known intergeneric hybrids in flowering plants and including a figure (23,675) of all the known hybrids including interspecife ones. No claims are made that the list is complete or absolutely accurate. Some of the strong points regarding hybridization as a process are given. In addition, it is pointed out that hybrids, throughout the range, show both dominance and intermediacy, some possess normal meiosis and many are highly or partially fertile.
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Irving W. Knobloch (1972) studied this question.
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