Orobanche picridis
Oxtongue Broomrape
Orobanche rapum-genistae
Greater Broomrape
Orthilia secunda
Serrated Wintergreen
Osmunda regalis
Royal Fern
Oxalis acetosella
Wood-sorrel
Oxalis incarnata
Pale Pink-sorrel
Oxybasis glauca
Oak-leaved Goosefoot
Papaver cambricum
Welsh Poppy
Pedicularis palustris
Marsh Lousewort
Pedicularis sylvatica
Lousewort
Persicaria amphibia
Amphibious Bistort
Persicaria lapathifolia
Pale Persicaria
Petasites hybridus
Butterbur
Petasites pyrenaicus
Winter Heliotrope
Petasites spurius
Petrorhagia prolifera
Proliferous Pink
Petrosedum forsterianum
Rock Stonecrop
Phacelia tanacetifolia
Phacelia
Phalaris arundinacea
Reed Canary-grass
Phegopteris connectilis
Beech Fern
Phelipanche purpurea
Yarrow Broomrape
Phleum pratense
Timothy
Pieris formosa
Pilosella aurantiaca
Fox-and-cubs