- palmate
- palynology
- panicle
- paniculate
- pantropical
- papery
- papilionaceous
- papillose
- parasitic
- parenchyma
- paripinnate
- parthenocarpy
- patelliform
- patent
- pauciflorous
- paucijuga
- pedicel
- pedicellate
- peduncle
- pedunculate
- pellucid
- peltate
- pendent
- penninerved
- pentamerous
- perfoliate
- perianth
- pericarp
- perisperm
- persistent
- petal
- petiolar
- petiolar gland
- petiolate
- petiole
- petiolulate
- petiolule
- phenology
- phenotype
- phloem
- phyllode
- phyllotaxis
- phylogenetic
- pilose
- pinna
- pinna gland
- pinnate
- pistil
- pith
- placenta
- pleurogram
- plicate
- plumose
- plumule
- plurifoliolate
- pod
- podsol
- pollen
- pollination
- polygamous
- polymorphic
- polyphyletic
- polyploid
- porate
- posterior
- poultice
- procumbent
- prop roots
- prostrate
- protandrous
- protogynous
- proximal
- pseudopedicel
- pseudoraceme
- puberulous
- pubescent
- pulses
- pulvinate
- pulvinule
- pulvinus
- punctate
- punctulate
- purgative
- pustular
- pyriform