Paris quadrifolia
Herb-paris
Passiflora foetida
Stinking Passionflower
Pastinaca sativa
Wild Parsnip
Pedicularis palustris
Marsh Lousewort
Pedicularis sylvatica
Lousewort
Pentaglottis sempervirens
Green Alkanet
Pentas lanceolata
Egyptian Starcluster
Peperomia pellucida
Pepper Elder
Persicaria amphibia
Amphibious Bistort
Persicaria chinensis
Chinese Knotweed
Persicaria hydropiper
Water-pepper
Persicaria lapathifolia
Pale Persicaria
Persicaria maculosa
Redshank
Persicaria minor
Small Water-pepper
Persicaria mitis
Tasteless Water-pepper
Petasites hybridus
Butterbur
Petasites japonicus
Giant Butterbur
Petasites pyrenaicus
Winter Heliotrope
Petasites spurius
Petrorhagia prolifera
Proliferous Pink
Petrosedum forsterianum
Rock Stonecrop
Petroselinum crispum
Garden Parsley
Phacelia tanacetifolia
Phacelia
Phalaenopsis amabilis
Moon Orchid
Phalaris arundinacea
Reed Canary-grass
Phanera kockiana
Orange Bauhinia
Phelipanche purpurea
Yarrow Broomrape
Philadelphus
Double Mock-orange
Philadelphus coronarius
Mock-orange
Phleum arenarium
Sand Cat's-tail
Phleum bertolonii
Smaller Cat's-tail
Phleum pratense
Timothy
Phlomis russeliana
Turkish Sage
Phragmites australis
Common Reed
Phuopsis stylosa
Caucasian Crosswort
Phyllanthus urinaria
Chamber Bitter
Picris hieracioides
Hawkweed Oxtongue
Pieris formosa
Pilosella aurantiaca
Fox-and-cubs
Pilosella officinarum
Mouse-ear-hawkweed
Pimpinella saxifraga
Burnet-saxifrage
Pinguicula lusitanica
Pale Butterwort
Pinguicula vulgaris
Common Butterwort
Pinus sylvestris
Scots Pine
Piper aduncum
Spiked Pepper
Plantago coronopus
Buck's-horn Plantain
Plantago lanceolata
Ribwort Plantain
Plantago major
Greater Plantain (subspecies intermedia)
Plantago maritima
Sea Plantain
Plantago media
Hoary Plantain
Platanthera bifolia
Lesser Butterfly-orchid
Platanthera chlorantha
Greater Butterfly-orchid
Platanthera chlorantha and bifolia
Butterfly orchids
Pleroma heteromallum
Silverleafed Princess Flower
Pluchea dioscoridis
Vimba
Plumbago auriculata
Cape Leadwort
Plumeria pudica
Bridal Bouquet
Plumeria rubra
Frangipani
Poa annua
Annual Meadow-grass
Poa compressa
Flattened Meadow-grass
Poa humilis
Spreading Meadow-grass
Polemonium pauciflorum
Fewflower Jacob's-ladder
Polygala serpyllifolia
Heath Milkwort
Polygala vulgaris
Common Milkwort
Polygonatum odoratum
Angular Solomon's-seal
Polygonatum x hybridum
Garden Solomon's-seal
Polypogon viridis
Water Bent
Populus nigra
Black-poplar
Populus tremula
Aspen
Potamogeton lucens
Shining Pondweed