How does that make evolution fail when it is what would be expected when trying to cross two different genera?
And how does that make evolution fail in the rare cases where such a hybrid has succeeded? You know of Luther Burbank's success in crossing a cabbage with a radish? That hybrid was not sterile.
And did I give any example of hybrids in explaining how genera are formed through speciation?
Speciation, after all, is the opposite of hybridization. It is not uniting two existing species. It is dividing one species into two species.
(There are some cases of getting a third species by inter-breeding two others, but that is far from the only way method of generating new species.)
We would get new species (and new genera and higher taxa) if all hybrids were sterile. Successful hybrids are just one more option. They don't have to succeed all the time, and evolution predicts that the farther apart the species are to begin with, the less likely a hybrid mating will succeed in producing viable and fertile offspring.
When you get the result you expect, that is not evidence that your theory is wrong.
Btw, the hybrid of wheat and rye you are speaking of is probably triticale.
Triticale - Wikipedia, the free encyclopedia It is not actually sterile, but that is because after the first crossing it is treated to induce polyploidy which renders it fertile. (Polyploidy is also commonly a feature in natural plant hybrids as well.)
Oh, and for Hentenza: polyploidy is another way to increase genetic information too.
I don't know who told you that, but it's wrong. Certainly higher taxa come into existence as new species emerge through speciation. But there is no need to depend on getting species from different genera to produce hybrids in order for evolution to happen. Higher taxa are built from species up as the initial species radiates into more species and the newer species do the same, and their descendants do the same. That is why speciation is THE macro-evolutionary event par excellence.