Thanks, Zach, for this clarifying that this is biennial rather than perennial and this clarification:
Sepp calls Black Locust (Robinia pseudoacacia), Acacia but it is really a pseudoacacia. There may be something similar going on here. The grain looks like Einkorn, and he calls it Einkorn, but it may be a relative or pseudo-Einkorn. I'm not sure.
Until "Sepp's grain" becomes more available, what other ancient grains do you and others recommend trying?
Also, I'm wondering if there are other details in the translations of Sepp's books where details have gotten lost?