triticum monococcum

Einkorn can refer to either a wild species of wheat (Triticum) or a domesticated form of wheat. The wild form is T. boeoticum, and the domesticated form is T. monococcum. Einkorn is a diploid species of hulled wheat, with tough glumes (husks) that tightly enclose the grains. The cultivated form is similar to the wild, except that the ear stays intact when ripe and the seeds are larger. The domestic form is known as petit épeautre in French, Einkorn in German, "einkorn" or "littlespelt" in English, piccolo farro in Italian and escanda menor in Spanish. The name refers to the fact that each spikelet contains only one grain. — Wikipedia