P. marginatum may refer to:
Piper marginatum, the cake bush, Anesi wiwiri, marigold pepper, Ti Bombé in Creole or Hinojo, a plant species found in moist, shady spots in the Amazon rainforest in Surinam, French Guiana and Brazil Plasmodium marginatum, a parasite species Pterosperma marginatum, a green algae species
See also Marginatum (disambiguation)