Osmunda regalis
Royal Fern
Oxalis acetosella
Wood-sorrel
Oxalis articulata
Pink-sorrel
Oxalis incarnata
Pale Pink-sorrel
Oxybasis glauca
Oak-leaved Goosefoot
Oxybasis rubra
Red Goosefoot
Panaeolina foenisecii
Brown Mottlegill
Panaeolus papilionaceus
Petticoat Mottlegill
Pancratium maritimum
Sea Daffodil
Papaver cambricum
Welsh Poppy
Papaver dubium
Long-headed Poppy
Papaver lecoqii
Yellow-juiced Poppy
Papaver rhoeas
Common Poppy
Pararge aegeria
Speckled Wood
Parentucellia viscosa
Yellow Bartsia
Parietaria judaica
Pellitory-of-the-wall
Paris quadrifolia
Herb-paris
Parnassia palustris
Grass-of-Parnassus
Passiflora suberosa
Corkystem Passionflower
Pastinaca sativa
Wild Parsnip
Pedicularis palustris
Marsh Lousewort
Pedicularis sylvatica
Lousewort
Pellia endiviifolia
Pellia spp.
Peltigera collina
Dog Lichen
Peltigera horizontalis
Dog Lichen
Peltigera spp.
Dog Lichen
Pentaglottis sempervirens
Green Alkanet
Persicaria amphibia
Amphibious Bistort
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
Petrorhagia prolifera
Proliferous Pink
Petrosedum forsterianum
Rock Stonecrop
Petrosedum rupestre
Reflexed Stonecrop
Peziza spp.
Phacelia tanacetifolia
Phacelia
Phalaris arundinacea
Reed Canary-grass
Phalaris canariensis
Canary-grass
Phegopteris connectilis
Beech Fern
Phelipanche purpurea
Yarrow Broomrape
Phellinus ferreus
Cinnamon Porecrust
Phellinus igniarius
Philadelphus
Double Mock-orange
Philadelphus coronarius
Mock-orange
Phleum arenarium
Sand Cat's-tail
Phleum bertolonii
Smaller Cat's-tail
Phleum pratense
Timothy
Phlomis russeliana
Turkish Sage
Pholiota squarrosa
Shaggy Scalycap
Phragmidium sp.
Phragmites australis
Common Reed
Phuopsis stylosa
Caucasian Crosswort
Physalis peruviana
Cape-gooseberry
Physarum cinereum
Physcia aipolia
Picea abies
Norway Spruce
Picea sitchensis
Sitka Spruce
Picea smithiana
Morinda Spruce
Picris hieracioides
Hawkweed Oxtongue
Pieris formosa
Pilosella aurantiaca
Fox-and-cubs
Pilosella officinarum
Mouse-ear-hawkweed
Pilularia globulifera
Pillwort
Pimpinella saxifraga
Burnet-saxifrage