#mountain_ash  any of various trees of the genus Sorbus
  supertype:  #angiospermous_tree__angiospermoustree__flowering_tree__floweringtree  any tree having seeds and ovules contained in the ovary
  member of:  #genus_Sorbus
  subtype:  #rowan_tree__rowantree__rowan__europeanmountainash__Sorbus_aucuparia  Eurasian tree with orange-red berrylike fruits
  subtype:  #American_mountain_ash__Sorbus_americana  a variety of mountain ash
  subtype:  #Western_mountain_ash__Sorbus_sitchensis  an ash of the Western coast of North America
  subtype:  #service_tree__servicetree__sorb_apple__sorb_apple_tree__Sorbus_domestica  medium-sized European tree resembling the rowan but bearing edible fruit
     subtype:  #wild_service_tree__Sorbus_torminalis  European tree bearing edible small speckled brown fruit

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