Or if my premise is wrong, please correct me?
Guns, Germs, & Steel talks about early domesticated crops of the Fertile Crescent. No surprise that he quickly mentions wheat, barley, olives, dates, grapes, figs, and pomegranates. He then talks about peas, lentils, and bitter vetch.
Lentils we've all seen early in the Torah, Jacob's stew. (There are plenty of Talmudic stories about lentils as well.) Vetch (karshinin) comes up in one halachic conversation or another several times in the Talmud. But where are the peas?