1) German biological term 2) One-grained wheat 3) Primitive form of wheat 
[Berg] Image from Film Star Who`s Who on the screen 1938. UK magazine. ...
Einkorn (Triticum monococcum) was the earliest domesticated cereal, first planted about 8500 BC. It is remarkable for producing high yields even under poor conditions, rarely failing to produce a reasonable yield. The ears are relatively small and very fragile, and the stems more grass-like than later cereals.
a wheat, Triticum monococcum, having a one-grained spikelet, grown as a forage crop in Europe and Asia.