The Collaborative International Dictionary of English v.0.48:

Spoonflower \Spoon"flow`er\ (-flou`[~e]r), n.
   The yautia.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

spoonflower
    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]