#yam_plant__yamplant__yam  any of a number of tropical vines of the genus Dioscorea many having edible tuberous roots
  supertype:  vine  weak-stemmed plant that derives support from climbing, twining, or creeping along a surface
  part:  yam.tuber
  member of:  genus_Dioscorea
  subtype:  white_yam__whiteyam__water_yam__wateryam__Dioscorea_alata  grown in Australasia and Polynesia for its large root with fine edible white flesh
  subtype:  cinnamon_vine__Chinese_yam__Dioscorea_batata  hardy Chinese vine naturalized in United States and cultivated as an ornamental climber for its glossy heart-shaped cinnamon-scented leaves and in the tropics for its edible tubers
  subtype:  air_potato__airpotato__dioscoreabulbifera  yam of tropical Africa and Asia cultivated for it large tubers
  subtype:  cush-cush__Dioscorea_trifida  tropical American yam with small yellow-skinned edible tubers

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