Ophrys apifera
Bee Orchid
Orchis mascula
Early-purple Orchid
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
Pararge aegeria
Speckled Wood
Paris quadrifolia
Herb-paris
Pastinaca sativa
Wild Parsnip
Pedicularis palustris
Marsh Lousewort
Pedicularis sylvatica
Lousewort
Pellia spp.
Persicaria amphibia
Amphibious Bistort
Persicaria bistorta
Common Bistort
Persicaria hydropiper
Water-pepper
Persicaria lapathifolia
Pale Persicaria
Persicaria maculosa
Redshank
Persicaria minor
Small Water-pepper
Persicaria mitis
Tasteless Water-pepper
Petasites fragrans
Winter Heliotrope
Petasites hybridus
Butterbur