- pachymorph
- palea
- panicle
- paniculate
- pantropical
- parenchyma
- particle board
- pedicel
- pendent
- pentosans
- perennial
- perfect flower
- pericarp
- persistent
- petiolate
- petiole
- phloem
- pilose
- pistil
- plumule
- plybamboo
- plywood
- pollen
- polymorphic
- polyploid
- posterior
- powder-post beetle
- preservative
- primordial
- primordium
- prop roots
- propagule
- prophyll
- proximal
- pruning
- pseudopetiole
- pseudospikelet
- puberulent
- puberulous
- pubescent
- pulp