#onion_plant__onionplant__onion__Allium_cepa  bulbous plant having hollow leaves cultivated worldwide for its rounded edible bulb
  supertype:  alliaceous_plant  bulbous plants having a characteristic pungent onion odor
  subtype:  eschalot  tree_onion  Welsh_onion  red-skinned_onion
  substance:  isothiocyanate
  part:  onion.bulb  edible bulb of an onion plant

No statement uses or specializes onion_plant; click here to add one.