Plantago maritima
Sea Plantain
Platanthera chlorantha
Greater Butterfly-orchid
Platanus orientalis
Oriental Plane
Platanus x hispanica
London Plane
Poa annua
Annual Meadow-grass
Poa compressa
Flattened Meadow-grass
Poa humilis
Spreading Meadow-grass
Polemonium caeruleum
Jacob's-ladder
Polygala serpyllifolia
Heath Milkwort
Polygala vulgaris
Common Milkwort
Polygonatum verticillatum
Whorled Solomon's-seal
Polygonum arenastrum
Equal-leaved Knotgrass
Polypodium cambricum
Southern Polypody
Polypodium interjectum
Intermediate Polypody
Polypodium vulgare
Polypody
Polystichum aculeatum
Hard Shield-fern
Polystichum lonchitis
Holly-fern
Populus nigra
Black-poplar
Populus tremula
Aspen
Potamogeton coloratus
Fen Pondweed
Potamogeton crispus
Curled Pondweed
Potamogeton lucens
Shining Pondweed
Potamogeton natans
Broad-leaved Pondweed
Potentilla anserina
Silverweed