Other nuts? are there other nuts that grow back into the ground?
i know some mangrove trees have trendrels that drop from branches and form new roots.. so the tree not only has a main trunk, but many small, trunk like appendages..each one forms it own root system. it's a very effective for a tree that grows in costal waters, and can be subject to storm damage. but it doesn't send seed pods underground.
aside from the peanut plant, and mangrove, i don't know of any other plant that have this geocarpy habit.
nor do i know of any true nuts that grow underground. i think the peanut is mistaken for a nut, because of its oilyness, and its firm crunchy texture. Legumes are not general thought of as an oil source (green pea oil any one?) but nuts are (walnut oil, almond oil) and some legumes are amost toxic eaten in a dry state.
