- Palea
- Pandurate
- Panicle
- Paniculate
- Papillae
- Papillose
- Papyraceous
- Paraphyletic
- Paratype
- Parietal
- Parsimonious
- Partial inflorescences
- Patent
- Pectinate
- Pedicel
- Peduncle
- Peloric
- Peltate
- Pendulous
- Pergamentaceous
- Perianth
- Persistent
- Petal
- Petaloid
- Petals
- Petiolate
- Petiole
- Phenology
- Phylogeny
- Pilose
- Pistil
- Placenta
- Plicate
- Pollen
- Pollinarium
- Pollinia
- Pollinium
- Polyphyletic
- Polyploid
- Porate
- Porrect
- Premorse
- Procumbent
- Proximally
- Pruinose
- Pseudobulb
- Puberulous
- Pubescent
- Punctate
- Pustulate
- Pustulose
- Pyramidal
- Pyriform