What structure of the water chestnut is classified as the edible portion, differentiating it from a true nut botanically?
Answer
The corm, which is the swollen underground stem
The edible part of the water chestnut, which is scientifically *Eleocharis dulcis*, is specifically identified as the corm. This corm is the swollen underground stem of the aquatic plant. Recognizing this structure is crucial because it clarifies why the water chestnut is categorized as a vegetable, despite its name suggesting a tree nut. This distinction is particularly important for individuals managing dietary restrictions related to actual nuts.
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