Fewer than you think. Most cultivars are probably recent, and the specific cultivar can matter—look up the Lenape potato. *Maybe* some grass-fed meats.https://twitter.com/PaulSkallas/status/1058060749329850368 …
Most wheat grown is probably from a cultivar more recent than that. It's hard to find data on which wheat cultivars are most common (there are a *lot* of them), but https://today.oregonstate.edu/archives/2010/aug/osu-wheat-varieties-dominate-industry-oregon-0 … >The most widely planted wheat variety in Oregon is ORCF 101, developed at OSU in 2003
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Other staples are probably similar, as are fruits and vegetables. Apples: McIntosh 1811, Red Delicious 1880, Gala 1930s, Fuji brought to market in 1962
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