#butterhead_lettuce  lettuce with relatively soft leaves in a loose head; easily broken or bruised
  supertype:  lettuce  leaves of any of various plants of Lactuca sativa
  subtype:  buttercrunch  Bibb_lettuce  Boston_lettuce
  part of:  head_lettuce__Lactuca_sativa_capitata  distinguished by leaves arranged in a dense rosette that develop into a compact ball

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