#duckweed  any small or minute aquatic plant of the family Lemnaceae that float on or near the surface of shallow ponds
  supertype:  #aquatic_plant__aquaticplant__water_plant__waterplant__hydrophyte__hydrophytic_plant__hydrophyticplant  a plant that grows partly or wholly in water whether rooted in the mud, as a lotus, or floating without anchorage, as the water hyacinth
  member of:  #family_Lemnaceae
  subtype:  #common_duckweed__lesser_duckweed__Lemna_minor  of temperate regions except eastern Asia and Australia
  subtype:  #star-duckweed__Lemna_trisulca  cosmopolitan in temperate regions except North America
  subtype:  #great_duckweed__greatduckweed__water_flaxseed__waterflaxseed__Spirodela_polyrrhiza  cosmopolitan except South America and New Zealand and some oceanic islands
  subtype:  #watermeal  any of various aquatic plants of the genus Wolffia; throughout warmer regions of the world
     subtype:  #common_wolffia__Wolffia_columbiana  smallest flowering plants known; of the Americas
  subtype:  #mud_midget__mudmidget__bogmat__Wolffiella_gladiata  having narrow flat sickle-shaped submerged fronds; North America

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