The Gemara learns out Matzah from Chametz, that only grains which can become Chametz are considered bread that they can be used for Matzah (and Challah, Chadash, etc.).

Yet one of the grains in the Mishnah is Shiboles Shu'al, which Rashi identifies as oat. One can just look at oat dough to see that it doesn't rise. How, then, can oats be considered a grain, when it doesn't fit the definition provided by the Gemara?

Doniel Filreis