Prot - Quav
- Psychrometrical
- Psychrometry
- Psylla
- Psylla pyri
- Psyllae
- Ptarmigan
- PtCl2
- PtCl4
- Ptelia trifoliata
- Ptenoglossa
- Ptenoglossate
- Pteranodon
- Pteranodontia
- Pteretis struthiopteris
- Pterichthys
- Pteridologist
- Pteridology
- Pteridomania
- Pteridophyta
- Pteridophyta
- Pteridophyta or Vascular Acrogens
- Pteridophyte
- Pteris aquilina
- Pterobranchia
- Pterobranchia
- Pterocarpus angolensis
- Pterocarpus angolensis
- Pterocarpus dalbergioides
- Pterocarpus Draco
- Pterocarpus erinaceus
- Pterocarpus erinaceus
- Pterocarpus Indicus
- Pterocarpus Marsupium
- Pterocarpus santalinus
- Pterocarpus santalinus
- Pteroceras
- Pterocletes
- Pteroclomorphae
- Pterocnemia Darwinii
- Pterocnemia pennata