#genus_Hydrilla  1 species
  supertype:  monocot_genus__monocotgenu__liliopsid_genus  genus of flowering plants having a single cotyledon (embryonic leaf) in the seed
  member of:  family_Hydrocharitaceae
  member:  hydrilla__Hydrilla_verticillata  submersed plant with whorled lanceolate leaves and solitary axillary flowers; Old World plant naturalized in southern United States and clogging Florida's waterways

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