Osmunda regalis
Royal Fern
Oxalis acetosella
Wood-sorrel
Oxybasis rubra
Red Goosefoot
Papaver cambricum
Welsh Poppy
Pararge aegeria
Speckled Wood
Parietaria judaica
Pellitory-of-the-wall
Paris quadrifolia
Herb-paris
Pedicularis palustris
Marsh Lousewort
Pedicularis sylvatica
Lousewort
Pellia spp.
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
Petrosedum forsterianum
Rock Stonecrop
Phalaris arundinacea
Reed Canary-grass
Phegopteris connectilis
Beech Fern
Philadelphus coronarius
Mock-orange
Phleum bertolonii
Smaller Cat's-tail