Persicaria maculosa
Redshank
Persicaria mitis
Tasteless Water-pepper
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
Phleum arenarium
Sand Cat's-tail
Phleum bertolonii
Smaller Cat's-tail
Phragmites australis
Common Reed
Phymatosorus scolopendria
Monarch Fern
Picea sitchensis
Sitka Spruce
Picea smithiana
Morinda Spruce
Picris hieracioides
Hawkweed Oxtongue
Pilosella officinarum
Mouse-ear-hawkweed
Pilularia globulifera
Pillwort
Pimpinella saxifraga
Burnet-saxifrage
Pinguicula lusitanica
Pale Butterwort
Pinguicula vulgaris
Common Butterwort
Pinus sylvestris
Scots Pine
Plantago coronopus
Buck's-horn Plantain
Plantago lanceolata
Ribwort Plantain
Plantago major
Greater Plantain (subspecies intermedia)
Plantago maritima
Sea Plantain
Platanthera chlorantha
Greater Butterfly-orchid
Platanthera chlorantha and bifolia
Platanus orientalis
Oriental Plane
Platanus x hispanica
London Plane
Platycerium coronarium
Elkhorn fern
Polemonium pauciflorum
Polygala serpyllifolia
Heath Milkwort
Polygonatum odoratum
Angular Solomon's-seal
Polygonatum x hybridum
Garden Solomon's-seal
Polygonum arenastrum
Equal-leaved Knotgrass
Polygonum oxyspermum
Ray's Knotgrass
Polypodium cambricum
Southern Polypody
Polypodium interjectum
Intermediate Polypody
Polypodium vulgare
Polypody
Polypodium vulgare sens. lat.
Polypody
Polypogon viridis
Water Bent
Polystichum setiferum
Soft Shield-fern
Polytrichum commune
Common haircap
Polytrichum juniperinum
Juniper Haircap
Populus nigra
Black-poplar
Populus x canadensis
Hybrid Black-poplar
Populus x canescens
Grey Poplar
Potamogeton coloratus
Fen Pondweed
Potamogeton crispus
Curled Pondweed
Potamogeton lucens
Shining Pondweed
Potamogeton natans
Broad-leaved Pondweed
Potamogeton polygonifolius
Bog Pondweed
Potentilla anserina
Silverweed
Potentilla erecta
Tormentil
Potentilla nitida
Pink Cinquefoil
Potentilla reptans
Creeping Cinquefoil
Potentilla rupestris
Rock Cinquefoil
Poterium sanguisorba
Salad Burnet
Primula veris
Cowslip
Primula vulgaris
Primrose
Procris repens
Watermelon Begonia
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