Common names: P
- pac choi
- pacaya palm
- Pacific red cedar
- Pacific service berry
- pacific yew
- pagoda dogwood
- pagoda flower
- pagoda tree
- painted lady
- painted tongue
- painted trillium
- pak choi
- pale persicaria
- pale purple cone flower
- pale smartweed
- pale-flowered fritillary
- palm cabbage
- Palm Springs daisy
- palmetto
- pampas grass
- Panama rose
- Panama rubber tree
- pandan leaves
- panicle hydrangea
- papaya
- paper birch
- paper daisy
- paper flower
- paper mulberry
- paperbark cherry
- paperbark maple
- parachute plant
- paracress
- paraguayo
- parrot feather
- parrot leaf
- parrot tulip
- parrot's bill
- parsley
- parsnip
- pasque flower
- pasqueflower
- passion flower
- passion fruit
- passionflower
- passionfruit
- patience dock
- patula pine
- paw paw
- pawpaw
- pea
- pea rose
- peace lily
- peach
- peach-leaved bellflower
- peacock plant
- peanut
- pear
- pear rust
- pearl bush
- pearl grass
- pearlbush
- pearly everlasting
- peashrub
- pecan nut
- pedunculate oak
- pee gee hydrangea
- pelargonium
- pelican flower
- pellitory-of-the-wall
- pendant amaranth
- pendulous sedge
- penny bun
- pennywort
- peony
- pepper
- pepperidge
- peppermint
- Père David's maple
- perennial cornflower
- perennial flax
- perennial goosefoot
- perennial honesty
- perennial lupin
- perfoliate honeysuckle
- perfume pink
- periwinkle
- perl millet
- Persian bells
- Persian buttercup
- Persian cornflower
- Persian cyclamen
- Persian ironwood
- Persian ivy
- Persian lilac
- Persian oak
- Persian onion
- Persian shallot
- Persian shield
- Persian stone cress
- Persian walnut
- Peruvian lily
- Peruvian pepper
- Peruvian vervain
- Peruvian water primrose
- Peruvian zinnia
- petunia
- pheasant's eye
- phlox
- pickerel weed
- pigeon berry
- Pignant's clover
- pilewort
- pimpernel
- pimpinellifolia rose
- pin oak
- pin-cushion hakea
- pincushion
- pincushion flower
- Pindrow fir
- pine
- pineapple
- pineapple broom
- pineapple flower
- pineapple guava
- pineapple lily
- pineapple mint
- pink
- pink agapanthus
- pink barren strawberry
- pink bubble persicaria
- pink calla
- pink evening primrose
- pink jasmine
- pink kopsia
- pink pearl lilac
- pink purslane
- pink rain lily
- pink sorrel
- pink stonecrop
- pink trumpet vine
- pink-flower indigo
- pinkhead smartweed
- pinyon pine
- pipevine
- pitcher plant
- plains eryngo
- plains prickly pear
- plane
- plantain
- plantain lily
- plum
- plum rust
- plume asparagus
- plume flower
- plume poppy
- plume thistles
- poached egg flower
- poached egg plant
- poc choi
- poet's daffodil
- pohutukawa
- poinsettia
- pointed cabbage
- poison arrow vine
- poison hemlock
- poison ivy
- poison oak
- pok choi
- poker primrose
- pokeweed
- polka dot plant
- polka-dot cactus
- pollarded willow
- polyantha rose
- Polynesian plum
- polypody
- polypore
- pomegranate
- pomelo
- pompom tree
- pompon dahlia
- pond lily
- Ponderosa pine
- Pontic azalea
- pontic rhododendron
- poor man's rhododendron
- poor-man's asparagus
- poplar
- poplar-leaved stonecrop
- poppy
- poppy anemone
- porcelain berry
- porcino
- porcupine tomato
- Port Jackson fig
- Portugal laurel
- Portuguese squill
- Portuguese sundew
- pot marigold
- potato
- potato bean
- potato tree
- potato vine
- powdered primrose
- prairie bluebells
- prairie cord grass
- prairie dropseed
- prairie flax
- prairie mallow
- prairie rose
- prairie sage
- Prairie smoke
- pretty verbena
- prettyface
- prickly bottlebrush
- prickly castor oil tree
- prickly glasswort
- prickly lettuce
- prickly pear
- prickly poppy
- prickly saltwort
- prickly sedge
- prickly thrift
- prickly wild rose
- pricklypear
- pride of Barbados
- pride of Bolivia
- pride of Madeira
- primrose
- prince's plume
- princess flower
- princess tree
- privet
- privet honeysuckle
- prostrate banksia
- protea
- Provence broom
- Przewalski's golden ray
- puffball
- pulai
- pumpkin
- purple amaranth
- purple apricot
- purple archangel
- purple beautyberry
- purple beech
- purple bell vine
- purple berkheya
- purple broom
- purple chokeberry
- purple cone flower
- purple devil
- purple foxglove
- purple giant hyssop
- purple granadilla
- purple gromwell
- purple head sneezeweed
- purple Jerusalem sage
- purple leaf barberry
- purple leaf plum
- purple leaf sand cherry
- purple loosestrife
- purple lovegrass
- purple milkweed
- purple moor grass
- purple mullein
- purple passion flower
- purple poppy mallow
- purple primrose
- purple rock cress
- purple salsify
- purple spurge
- purple trumpet pitcher
- purple viper's bugloss
- purple willow
- purple-flowered onion
- purpletop vervain
- purslane
- pussy willow
- pygmy date palm
- pyramidal orchid
- pyramidal saxifrage
- Pyrenean honeysuckle
- Pyrenean saxifrage
- pyrethrum