Petasites hybridus
Butterbur
Petasites japonicus
Giant Butterbur
Petasites pyrenaicus
Winter Heliotrope
Petrosedum forsterianum
Rock Stonecrop
Petrosedum rupestre
Reflexed Stonecrop
Phalaris arundinacea
Reed Canary-grass
Phegopteris connectilis
Beech Fern
Phellinus igniarius
Philadelphus coronarius
Mock-orange
Phleum bertolonii
Smaller Cat's-tail
Phleum pratense
Timothy
Phlomis russeliana
Turkish Sage
Pholiota squarrosa
Shaggy Scalycap
Phragmites australis
Common Reed
Picea abies
Norway Spruce
Picea sitchensis
Sitka Spruce
Picris hieracioides
Hawkweed Oxtongue
Pilosella officinarum
Mouse-ear-hawkweed
Pilularia globulifera
Pillwort
Pimpinella saxifraga
Burnet-saxifrage
Pinguicula vulgaris
Common Butterwort
Pinus sylvestris
Scots Pine
Plagiomnium undulatum
Hart’s-tongue Thyme-moss
Plantago coronopus
Buck's-horn Plantain
Plantago lanceolata
Ribwort Plantain
Plantago major
Greater Plantain (subspecies intermedia)
Platanthera chlorantha
Greater Butterfly-orchid
Poa annua
Annual Meadow-grass
Poa humilis
Spreading Meadow-grass
Poa trivialis
Rough Meadow-grass
Pogonatum aloides
Aloe Haircap
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
Polygonum arenastrum
Equal-leaved Knotgrass
Polyommatus icarus
Common Blue
Polypodium cambricum
Southern Polypody
Polypodium interjectum
Intermediate Polypody
Polypodium vulgare
Polypody
Polypodium vulgare sens. lat.
Polypody
Polypogon viridis
Water Bent
Polystichum aculeatum
Hard Shield-fern
Polystichum setiferum
Soft Shield-fern
Polytrichum commune
Common Haircap
Populus nigra
Black-poplar
Populus tremula
Aspen
Populus x canadensis
Hybrid Black-poplar
Populus x canescens
Grey Poplar
Potamogeton lucens
Shining Pondweed
Potamogeton natans
Broad-leaved Pondweed
Potamogeton polygonifolius
Bog Pondweed
Potentilla erecta
Tormentil
Potentilla rupestris
Rock Cinquefoil
Poterium sanguisorba
Salad Burnet
Preissia quadrata
Primula veris
Cowslip
Primula vulgaris
Primrose
Primula x polyantha
False Oxlip
Prunella vulgaris
Selfheal
Prunus avium
Wild Cherry
Prunus cerasifera
Cherry Plum
Prunus domestica
Wild Plum
Prunus padus
Bird Cherry
Prunus spinosa
Blackthorn
Pseudofumaria lutea
Yellow Corydalis
Pseudorchis albida
Small-white Orchid
Pseudotsuga menziesii
Douglas Fir
Pteridium aquilinum
Bracken