Pacific Anemone
Pagoda-plant
Painted Milkvetch
Palafox
Pale Agoseris
Pale Bastard Toadflax
Pale Dock
Pale Indian Plantain
Pale Madwort
Pale Purple Coneflower
Pale Spikerush
Pale Touch-me-not
Palespike Lobelia
Paleyellow Iris
Palmleaf Indian Breadroot
Panicgrass
Panicled Bulrush
Panicledleaf Ticktrefoil
Paper Birch
Paradox Cinquefoil
Parasol Sedge
Parasol Whitetop
Parsnip
Partridge Pea
Pasqueflower
Patience Dock
Pawpaw
Pea
Peachleaf Willow
Pear Hawthorn
Pearl Millet
Pearly Everlasting
Peashrub
Pellitory
Pennsylvania Bittercress
Pennsylvania Buttercup
Pennsylvania Cinquefoil
Pennsylvania Pellitory
Pennsylvania Smartweed
Pennycress
Penthorum
Peppermint
Peppervine
Pepperweed