Persicaria amphibia
Amphibious Bistort
Persicaria chinensis
Creeping Smartweed
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
Petrosedum forsterianum
Rock Stonecrop
Petrosedum rupestre
Reflexed Stonecrop
Petroselinum crispum
Garden Parsley
Phacelia tanacetifolia
Phacelia
Phalaris arundinacea
Reed Canary-grass
Phedimus kamtschaticus
Kamchatka Stonecrop
Philadelphus
Double Mock-orange
Philadelphus coronarius
Mock-orange
Philodendron burle-marxii
Burle Marx's Philodendron
Philodendron erebuscens
Blushing Philodendron
Phlebodium decumanum
Creeping Golden Polypody
Phoenix dactylifera
Date Palm
Phragmites australis
Common Reed
Phuopsis stylosa
Caucasian Crosswort
Phymatosorus scolopendria
Monarh Fern
Picea koyamai
Kotama's Spruce
Picris hieracioides
Hawkweed Oxtongue
Pieris japonica
Pilea cadierei
Aluminium Plant
Pilea microphylla
Angeloweed
Pilea nummulariifolia
Creeping Charlie
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 sylvestris
Scots Pine
Pistia stratiotes
Water Cabbage
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 chlorantha
Greater Butterfly-orchid
Platanus orientalis
Oriental Plane
Platanus x hispanica
London Plane
Pleroma semidecandrum
Princess Flower
Pleroma urvilleaum
Glory Bush
Pluchea dioscoridis
Vimba
Plumeria obtusa
Frangipani
Poa annua
Annual Meadow-grass
Poa compressa
Flattened Meadow-grass
Poa humilis
Spreading Meadow-grass
Podocarpus macrophyllus
Yew Plum Pine
Polemonium caeruleum
Jacob's-ladder
Polygala serpyllifolia
Heath Milkwort
Polygala vulgaris
Common Milkwort
Polygonatum verticillatum
Whorled Solomon's-seal
Polygonum arenastrum
Equal-leaved Knotgrass
Polypodium cambricum
Southern Polypody
Polypodium interjectum
Intermediate Polypody
Polypodium vulgare
Polypody
Polyscias fruticosa
Ming Aralia
Polyscias guilfoylei
Geranium Aralia
Polystichum aculeatum
Hard Shield-fern
Polystichum lonchitis
Holly-fern
Populus nigra
Black-poplar
Populus tremula
Aspen