non-comprehensive list from whole grain council:
* Amaranth
* Barley
* Buckwheat
* Corn, including whole cornmeal and popcorn
* Millet
* Oats, including oatmeal
* Quinoa
* Rice, both brown rice and colored rice
* Rye
* Sorghum (also called milo)
* Teff
* Triticale
* Wheat, including varieties such as spelt, emmer, farro, einkorn, Kamut®, durum and forms such as bulgur, cracked wheat and wheatberries
* Wild rice