P. nigra may refer to:

Animals edit

Plants edit

  • Phyllostachys nigra, a bamboo species
  • Pinus nigra, a variable species of pine, occurring across southern Europe from Spain to the Crimea, and also in Asia Minor, Cyprus and locally in the Atlas Mountains of northwest Africa
  • Populus nigra, the black poplar, a tree species
  • Prosopis nigra, a South American leguminous tree species that inhabits the Gran Chaco ecoregion in Argentina and Paraguay
  • Prunus nigra, a tree species native to eastern North America from New Brunswick west to southeastern Manitoba and south to Connecticut across to Iowa

See also edit