Picris hieracioides
Hawkweed Oxtongue
Pieris formosa
Pilea cadierei
Aluminium Plant
Pilea nummulariifolia
Creeping Charlie
Pilosella aurantiaca
Fox-and-cubs
Pilosella officinarum
Mouse-ear-hawkweed
Pilularia globulifera
Pillwort
Pimpinella saxifraga
Burnet-saxifrage
Pinguicula grandiflora
Large-flowered Butterwort
Pinguicula leptoceras
Pinguicula lusitanica
Pale Butterwort
Pinguicula vulgaris
Common Butterwort
Pinus muricata
Bishop Pine
Pinus nigra
Austrian Pine
Pinus radiata
Monterey Pine
Pinus sylvestris
Scots Pine
Piper aduncum
Spiked Pepper
Pistia stratiotes
Water Cabbage
Plagiomnium undulatum
Hart’s-tongue Thyme-moss
Plantago coronopus
Buck's-horn Plantain
Plantago lanceolata
Ribwort Plantain
Plantago major
Greater Plantain
Plantago maritima
Sea Plantain
Plantago media
Hoary Plantain
Platanthera bifolia
Lesser Butterfly-orchid
Platanthera chlorantha
Greater Butterfly-orchid
Platanthera chlorantha and bifolia
Platanthera x hybrida
Platanus orientalis
Oriental Plane
Platanus x hispanica
London Plane
Platycerium bifurcatum
Elkhorn Fern
Platycerium coronarium
Elkhorn fern
Pleroma semidecandrum
Princess Flower
Plumbago auriculata
Cape Leadwort
Plumeria alba
Caterpillar Tree
Plumeria obtusa
Frangipani
Poa annua
Annual Meadow-grass
Podocarpus macrophyllus
Yew Plum Pine
Polemonium pauciflorum
Fewflower Jacob's-ladder
Polygala calcarea
Chalk Milkwort
Polygala fruticosa
Feather Dusters
Polygala serpyllifolia
Heath Milkwort
Polygala vulgaris
Common Milkwort
Polygonatum multiflorum
Solomon's-seal
Polygonatum odoratum
Angular Solomon's-seal
Polygonatum verticillatum
Whorled 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
Polypogon viridis
Water Bent
Polyscias fruticosa
Ming Aralia
Polyscias guilfoylei
Geranium Aralia
Polystichum aculeatum
Hard Shield-fern
Polystichum setiferum
Soft Shield-fern
Polytrichum commune
Common haircap
Pontederia crassipes
Water Hyacinth
Populus nigra
Black-poplar
Populus tremula
Aspen
Populus x canadensis
Hybrid Black-poplar
Populus x canescens
Grey Poplar
Portulaca oleracea
Common Purslane
Portulaca quadrifida
Pusley
Potamogeton crispus
Curled Pondweed
Potamogeton lucens
Shining Pondweed
Potamogeton natans
Broad-leaved Pondweed
Potamogeton polygonifolius
Bog Pondweed
Potentilla anserina
Silverweed