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Potato

The potato (Solanum tubersosum) is one of the world's most productive, nutritious, and tasty vegetables, and it is the fourth most important food worldwide regarding production (following rice, wheat, and corn). It is the most economically valuable and well-known member of the plant family Solanaceae, which contains such foods as tomatoes and peppers, and flowers such as the petunia. The edible tubers of potato are actually swollen underground stems, in contrast to the similarly appearing sweet potatoes, which have swollen roots, and are a member of the separate family Convovulaceae (morning glory family).

Early peoples in the high Andes Mountains of Bolivia and Peru, where many wild potato species grow, likely selected the potato as a food about ten thousand years ago. This is a time when many crops were believed to have been selected in Andean South America, and dried potato remains date from about seven thousand years ago from caves in Central Peru. Wild potato species have a geographic range from the southwestern United States to south-central Chile. There is much controversy regarding the number of wild potato species, from perhaps only one hundred to over two hundred.

The potato was not introduced into Europe until the late sixteenth century, where it was only slowly accepted as a food, and even then only by the poor. The potato is infected by many diseases and requires a lot of care. The fungal disease potato late blight was the cause of the devastating Irish potato famine that began in 1846. The famine killed more than one million people and stimulated the huge immigration of Irish people to continental Europe and the United States.