Rebbetzin, every posek I’ve seen on the subject, except Reb Moshe, takes for granted that the gezera (or takana) was not on specific species but on the entire categories of seeds that grow in pods and pesudo-grains, and therefore peanuts are forbidden. The best proof is from mustard, which is forbidden only because it grows in pods. Corn was also unknown when the gezera was made, and yet not even Reb Moshe permitted it.
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