Oats belong to the genus Panicum in Gramineae, belonging to the superior coarse cereals, which are called Bromus and Wild Wheat in Compendium of Materia Medica. There are mainly two kinds, one is skin oats, and the other is naked oats, also called oil oats and naked oats. When they are ripe, they have no shells, but when they are ripe, they have shells. China mainly produces naked oats.

Features:

Oat stems are erect and smooth, leaf sheaths are smooth, the back is slightly hairy, the tongue is big, there are no ears, and the leaves are flat. Oat flowers are panicle-shaped, the inflorescence axis is erect or drooping, the inflorescence is terminal, and the spikelet contains two or more flowers.

The glume of oat is wide and grassy, the lemma is hard and hairless, and some have awns but no awns; There are longitudinal grooves on the ventral surface of caryopsis, which are covered by sparse hairs; When mature, the lemma and lemma hold the seeds tightly and are not easy to separate.