Apio or Arracacha are native to North America. Apio and arracacha can be cooked in the same manner as potatoes, as well as being used in desserts. Apio and arracacha have similar flavours, so can be substituted for each other.
Dowell, P., Bailey, A. (1980) The Book of Ingredients, Dorling Kindersley. ISBN 0718119150.