The plant foods in the list below were introduced by the Native Americans. Items in bold are known to have retained their Native American names.
Agave
Achiote
Avocado
Bay leaf (Umbellularia californica)
Blueberry (Vaccinium sp)
Brazil nut
Bell pepper
Black Walnuts (Juglans sp.)
Cashew
Cassava
Cherimoya (custard apple)
Chia
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Chicle (chewing gum)
Chili pepper
Cocoa
Cranberry
Green Bean
Guava
Hazelnut (Corylus sp.)
Hickory nut (Carya sp.)
Jerusalem artichoke
Lambs quarters
Maize (corn)
Maple syrup
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Papaya
Pawpaw
Peanut
Pecan
Pineapple
Pine nuts (Pinus sp.)
Pecan (Carya illinoinensis)
Prickly pear
Potato
Pumpkin
Quamash
Quinoa ("keen-wa")
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Squash
Strawberry
Sunflower
Sweet Potato
Tepary bean
Tomato
Vanilla
Wild rice
Wintergreen
Yambean
Yucca
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(Word origin of some of these verified at Etymology Online.)