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 
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.)