There isn't a single "cereal genus." The term "cereal" refers to a group of grasses that are cultivated for their edible grains. These grains are used to make various food products like bread, pasta, porridge, and more.

Here are some of the most common genera that fall under the umbrella of "cereal":

* Triticum: Wheat (e.g., durum wheat, bread wheat)

* Oryza: Rice (e.g., Asian rice, African rice)

* Zea: Maize (corn)

* Avena: Oats

* Hordeum: Barley

* Sorghum: Sorghum

* Panicum: Millet (e.g., pearl millet, finger millet)

* Secale: Rye

So, rather than a single genus, the term "cereal" encompasses multiple genera of grasses that share the characteristic of being cultivated for their edible grains.