A stem tuber has axial buds. Such as "eyes" on a potato.
A potato produce underground tubers. It is the tubers that are edible.
The potato tubers (potatoes) grow below the ground, but most of the potato plant (leaves etc.) grows above ground.
they both grow on roots
no a sweet potato is a tubers
NO a tuber is a modified stem used to store water and nutrients when the plant is dormant so that it has enough energy to grow during the next growing season. To say tubers are all vegetables is wrong as begonias are grown from tubers but the tubers are toxic if eaten, the same goes for Dahlia tubers. The only reason why some people call potato a vegetable is because the majority of the potato is used for water and nutrient storage which makes it very starchy and edible. While any other part of the potato which is green ie. stems and leaves are actually poisonous.
You eat the tubers (potatoes) that grow underground. The green stems, flowers and leaves are poisonous, even any tubers that have become green, should not be eaten. the poison is Solanine (very toxic even in small amounts).
potato Sweet potatoes Begonia Cyclamen
Sweet potato, like white (etc.) potatoes are tubers, in other words, edible roots. They grow underground. (in the ground.)
255 years no, you got it wrong. it takes 60 milleniums to grow them.
dahlias reproduce by using tubers
potato chines lantern plant