Ornithopus perpusillus
Bird's-foot
Orthilia secunda
Serrated Wintergreen
Osmoxylon lineare
Green Aralia
Osmunda regalis
Royal Fern
Oxalis acetosella
Wood-sorrel
Oxalis corniculata
Creeping Woodsorrel
Oxalis triangularis
False Shamrock
Oxybasis glauca
Oak-leaved Goosefoot
Oxybasis rubra
Red Goosefoot
Pandanus tectorius
Thatch Screwpine
Panicum trichanthum
Thicket Panic Grass
Papaver cambricum
Welsh Poppy
Parentucellia viscosa
Yellow Bartsia
Parietaria judaica
Pellitory-of-the-wall
Paris quadrifolia
Herb-paris
Parnassia palustris
Grass-of-Parnassus
Passiflora suberosa
Corkystem Passionflower
Paulownia tomentosa
Foxglove-tree
Pedicularis palustris
Marsh Lousewort
Pelargonium zonale
Zonal Geranium
Pentaglottis sempervirens
Green Alkanet
Peperomia pellucida
Pepper Elder
Peperomia polybotrya
Raindrop Peperomia
Pereskia aculeata
Barbados Gooseberry
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
Pilea spruceana
Silver Tree
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
Plagiogyria glauca
Blue Plagiogyria
Plantago coronopus
Buck's-horn Plantain
Plantago lanceolata
Ribwort Plantain
Plantago major
Greater Plantain (subspecies intermedia)
Plantago maritima
Sea Plantain