1. Of the eastern United States: New Jersey to South Carolina
   - Narthecium americanum

Type of: bog asphodel

• genus Phylloxera
• genus Physa
• genus Physalia
• genus Physalis
• genus Physaria
• genus Physeter
• genus Physostegia
• genus Physostigma
• genus Phytelephas
• genus Phytolacca
• genus Phytophthora
• genus Pica
• genus Picea
• genus Pickeringia
• genus Picoides
• genus Picrasma
• genus Picris
• genus Picumnus
• genus Picus
• genus Pieris
• genus Pilea
• genus Pilosella
• genus Pilularia
• genus Pimenta
• genus Pimpinella