The Collaborative International Dictionary of English v.0.48:

Yautia \Yau*ti"a\, n. [Native name in the Antilles.]
   In Puerto Rico, any of several araceous plants or their
   starchy edible roots, which are cooked and eaten like yams or
   potatoes, as the taro.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

yautia
    n 1: tropical American aroid having edible tubers that are
         cooked and eaten like yams or potatoes [syn: yautia,
         tannia, spoonflower, malanga, Xanthosoma
         sagittifolium, Xanthosoma atrovirens]