Oreopteris limbosperma
Lemon-scented Fern
Ornithopus perpusillus
Bird's-foot
Orobanche hederae
Ivy Broomrape
Orobanche rapum-genistae
Greater Broomrape
Orthilia secunda
Serrated Wintergreen
Osmunda regalis
Royal Fern
Oxalis acetosella
Wood-sorrel
Oxybasis rubra
Red Goosefoot
Papaver cambricum
Welsh Poppy
Papaver rhoeas
Common Poppy
Parentucellia viscosa
Yellow Bartsia
Parietaria judaica
Pellitory-of-the-wall
Paris quadrifolia
Herb-paris
Pedicularis palustris
Marsh Lousewort
Pedicularis sylvatica
Lousewort
Persicaria amphibia
Amphibious Bistort
Persicaria lapathifolia
Pale Persicaria
Persicaria maculosa
Redshank
Persicaria mitis
Tasteless Water-pepper
Petasites hybridus
Butterbur
Petasites japonicus
Giant Butterbur
Petasites pyrenaicus
Winter Heliotrope
Petrosedum forsterianum
Rock Stonecrop
Phalaris arundinacea
Reed Canary-grass