Polygonum aviculare
Knotgrass
Polypodium cambricum
Southern Polypody
Polypodium vulgare
Polypody
Polyporus squamosus
Dryad's Saddle
Populus x canadensis
Hybrid Black-poplar
Potentilla anserina
Silverweed
Potentilla erecta
Tormentil
Potentilla reptans
Creeping Cinquefoil
Potentilla sterilis
Barren Strawberry
Potentilla verna
Spring Cinquefoil
Poterium sanguisorba
Salad Burnet
Primula veris
Cowslip
Primula vulgaris
Primrose
Prunella vulgaris
Selfheal
Prunus avium
Wild Cherry
Prunus domestica
Wild Plum
Prunus laurocerasus
Cherry Laurel
Prunus spinosa
Blackthorn
Pseudofumaria lutea
Yellow Corydalis
Pteridium aquilinum
Bracken
Puccina coronata
Crown Rust
Pulicaria dysenterica
Common Fleabane
Quercus ilex
Evergreen Oak
Quercus robur
Pedunculate Oak
Ranunculus acris
Meadow Buttercup
Ranunculus bulbosus
Bulbous Buttercup
Ranunculus flammula
Lesser Spearwort
Ranunculus parviflorus
Small-flowered Buttercup
Ranunculus sceleratus
Celery-leaved Buttercup
Ranunculus trichophyllus
Thread-leaved Water-crowfoot
Raphanus raphanistrum
Sea Radish
Reseda luteola
Weld
Rhinanthus minor
Yellow-rattle
Ribes rubrum
Red Currant
Rosa canina agg
Dog-rose
Rosa rubiginosa
Sweet-briar
Rosa rugosa
Japanese Rose
Rosa stylosa
Short-styled Field-rose
Rubia peregrina
Wild Madder
Rubus fruticosus agg.
Blackberry
Rubus idaeus
Raspberry
Rumex acetosa
Common Sorrel
Ruscus aculeatus
Butcher's-broom
Sabulina verna
Spring Sandwort
Sagittaria sagittifolia
Arrowhead
Salicornia europaea
Common Glasswort
Salix alba
White Willow
Salix caprea
Goat Willow
Salix purpurea
Purple Willow
Salsola kali
Prickly Saltwort
Salvia verbenaca
Wild Clary
Sambucus nigra
Elder
Sanicula europaea
Sanicle
Saponaria officinalis
Soapwort
Saxifraga tridactylites
Rue-leaved Saxifrage
Scabiosa columbaria
Small Scabious
Scrophularia nodosa
Common Figwort
Scutellaria galericulata
Skullcap
Sedum acre
Biting Stonecrop
Sedum album
White Stonecrop
Senecio vulgaris
Groundsel
Sherardia arvensis
Field Madder
Silene dioica
Red Campion
Silene latifolia
White Campion
Silene uniflora
Sea Campion
Silybum marianum
Milk Thistle
Sison amomum
Stone Parsley
Smyrnium olusatrum
Alexanders
Solanum dulcamara
Bittersweet
Soleirolia soleirolii
Mind-your-own-business