Despite having the word 'nut' right in their name, peanuts are not actually true nuts. From a botanical perspective, the classification of the peanut surprises many people.
Because peanuts grow in pods underground, they are known by many different names around the world, including groundnuts, earthnuts, goobers, goober peas, and monkey nuts.
Botanically speaking, a peanut is a legume, not a tree nut.
Legumes are edible seeds enclosed in pods, and they belong to the same plant family (Leguminosae or Fabaceae) as peas, beans, lentils, and chickpeas.
So, while they are not literally 'peas', they are very closely related to green peas. This makes the question 'are peanuts peas?' closer to the truth than 'are peanuts nuts?'.
Here is the key biological difference:
Tree Nuts: These grow on trees. They are hard-shelled pods that contain both the fruit and the seed, and they do not open on their own to release the seed. Examples: Walnuts, Almonds, Pecans, Hazelnuts, Cashews.
Legumes (Peanuts): These grow underground. The peanut plant flowers above ground, but after pollination, the heavy flower stems droop down and burrow into the soil. The peanut pod (containing the seeds) matures underground!
We call them nuts for culinary and nutritional reasons.
In the kitchen, peanuts behave exactly like tree nuts. They have a similar taste profile, a high fat content, are packed with protein, and are used in cooking, baking, and snacking just like almonds or walnuts. Because they taste and act like nuts, society simply labeled them as such.
This botanical difference is extremely important in the medical world.
Because peanuts are legumes and not tree nuts, a person can have a severe peanut allergy but still be perfectly able to eat almonds or walnuts (tree nuts) without any reaction. Conversely, someone might be allergic to tree nuts but fine with peanuts. (However, some people are unfortunately allergic to both).
Botanically, legumes are considered a type of dry fruit. A fruit is defined as the seed-bearing structure that develops from the ovary of a flowering plant. Since peanut pods hold seeds and develop from flowers, they are botanically fruits!
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