#lettuce.herbaceous_plant  any of various plants of the genus Lactuca
  supertype:  herbaceous_plant__herb  a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests
  member of:  genus_Lactuca
  subtype:  garden_lettuce__common_lettuce__Lactuca_sativa  annual or perennial garden plant having succulent leaves used in salads; widely grown
  subtype:  cos_lettuce__coslettuce__romaine_lettuce__romainelettuce__Lactuca_sativa_longifolia  lettuce with long dark-green spoon-shaped leaves
  subtype:  head_lettuce__Lactuca_sativa_capitata  distinguished by leaves arranged in a dense rosette that develop into a compact ball
  subtype:  leaf_lettuce__Lactuca_sativa_crispa  distinguished by leaves having curled or incised leaves forming a loose rosette that does not develop into a compact head
  subtype:  stem_lettuce__celtuce__Lactuca_sativa_asparagina  lettuce valued especially for its edible stems

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