Gastrodia cunninghamii.

Botanical name: 

Gastrodia cunninghamii Hook. f. Orchideae. Peri-Root.

New Zealand. The root of this orchid is eaten by the natives of New Zealand, who call it peri; it is about 18 inches long, as thick as the finger and full of starch.

Sturtevant's Edible Plants of the World, 1919, was edited by U. P. Hedrick.