-
Odontites vernus
Red Bartsia
-
Oenanthe aquatica
Water-dropwort, Fine-leaved
-
Oenanthe crocata
Water-dropwort, Hemlock
-
Oenanthe fistulosa
Water-dropwort, Tubular
-
Oenanthe lachenalii
Water-dropwort, Parsley
-
Ononis repens
Common Restharrow
-
Ophrys apifera
Bee Orchid
-
Ophrys insectifera
Fly Orchid
-
Orchis mascula
Early-purple orchid
-
Orchis morio
Green-winged Orchid
-
Origanum vulgare
Wild Marjoram
-
Orobanche alba
Thyme Broomrape
-
Orobanche hederae
Ivy Broomrape
-
Orobanche minor
Broomrape, Common
-
Oxalis acetosella
Wood-sorrel
-
Papaver dubium
Lond-headed Poppy
-
Papaver rhoeas
Common Poppy
-
Parietaria judaica
Pellitory-of-the-wall
-
Parnassia palustris
Grass-of-Parnassus
-
Pastinaca sativa
Parsnip, Wild
-
Pedicularis palustris
Marsh Lousewort
-
Pedicularis sylvatica
Lousewort
-
Pentaglottis sempervirens
Green Alkanet
-
Persicaria amphibia
Amphibious Bistort
-
Persicaria campanulata
knotweed, Lesser
-
Persicaria hydropiper
Water-pepper
-
Persicaria maculosa
Redshank
-
Persicaria minor
Small Water-pepper
-
Persicaria wallichii
Himalayan Knotweed
-
Petasites fragrans
Winter Heliotrope
-
Petasites hybridus
Butterbur
-
Petroselinum crispum
Garden Parsley
-
Phormium tenax
New Zealand Flax
-
Picris hieracioides
Ox-tongue
-
Pilosella officinarum
Mouse-ear Hawkweed
-
Pimpinella major
Burnet-saxifrage, Greater
-
Pimpinella saxifraga
Burnet Saxifrage
-
Pinguicula grandiflora
Large-flowered Butterwort
-
Pinguicula lusitanica
Pale Butterwort
-
Pinguicula vulgaris
Butterwort, Common
-
Plantago coronopus
Buck's-horn Plantain
-
Plantago lanceolata
Ribwort Plantain
-
Plantago major
Greater Plantain
-
Plantago maritima
Plantain, Sea
-
Platanthera bifolia
Lesser Butterfly-orchid
-
Platanthera chlorantha
Greater Butterfly-orchid
-
Polygala serpyllifolia
Heath Milkwort
-
Polygala vulgaris
Milkwort, Common
-
Polygonum arenastrum
Equal-leaved Knotgrass
-
Polygonum aviculare
Knotgrass