Potato Flower

Potato flower is made from potatoes, including their skins. The potatoes are cooked, skins on, then dried and ground finely. It can be used as a thickener to some degree (though it does not thicken as well as Potato Starch, however) and in some baked goods, as it retains moisture.
Potato starch is often also called potato flour. Don’t confuse the two, however.

Potato Flour is heavier in weight than Potato Starch;
Potato Flour has a potato flavour to it; Potato Starch has no discernible flavour;
Potato Starch can thicken a greater amount of liquid than Potato Flour can; if you try to use Potato Flour instead to thicken an identical amount of liquid, you’d end up with a gloopy mess.!