#walnut_tree__walnut  any of various trees of the genus Juglans
  supertype:  #nut_tree__nuttree  tree bearing edible nuts
  part:  #walnut
  substance:  #walnut.wood
  member of:  #genus_Juglans
  subtype:  #California_black_walnut__Juglans_californica  medium-sized tree with somewhat aromatic compound leaves and edible nuts
  subtype:  #butternut_tree__butternuttree__butternut__white_walnut__whitewalnut__juglanscinerea  North American walnut tree having light-brown wood and edible nuts; source of a light-brown dye
  subtype:  #black_walnut_tree__black_walnut__blackwalnut__black_hickory__blackhickory__Juglans_nigra  North American walnut tree with hard dark wood and edible nut
  subtype:  #English_walnut_tree__English_walnut__Circassian_walnut__Persian_walnut__Juglans_regia  Eurasian walnut valued for its large edible nut and its hard richly figured wood; widely cultivated

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