I imagine the same applies to tomato varieties, now considered heirlooms in their adopted country, whose origin actually is the United States, but carried back by exchange students, naturalized U.S. citizens visiting their relatives, or via some other means of transport from the U.S. to the adoptive country.
Also, I wonder about the true origin of "black" tomatoes supposedly native to the U.S., yet sharing the same gf genes with "black" tomatoes supposedly native to the former USSR, France, and the Philippines.
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