Actually, there is evidence that speciation has occurred in a species of plant in California called Clarkia. In this plant there are many peripheral populations, where there is an extreme boom-bust cycle of population growth. The biogeography and ecology of these Clarkia plants is consistent with the mode of speciation. Natural selection does not create new genes. It selects genes that are already present.
Mutation is the ONLY source of novel genetic material.
However, huge recombinant changes can lead to dramatic differences. Your last sentence is nonsensical. Several of these are likely necessary for reproductive isolating mechanisms to evolve. In this plant there are many peripheral populations, where there is an extreme boom-bust cycle of population growth. The biogeography and ecology of these Clarkia plants is consistent with the mode of speciation.