Potato

A plant (Solanum tuberosum) of the Nightshade family, and its esculent farinaceous tuber, of which there are numerous varieties used for food. It is native of South America, but a form of the species is found native as far north as New Mexico.

The sweet potato (see below).

annual native to South America having underground stolons bearing edible starchy tubers; widely cultivated as a garden vegetable; vines are poisonous

an edible tuber native to South America; a staple food of Ireland