Pagoda-plant
Painted Milkvetch
Palafox
Pale Bastard Toadflax
Pale Desert-thorn
Pale Dock
Pale Indian Plantain
Pale Leather Flower
Pale Lobelia
Pale Purple Coneflower
Pale Spikerush
Pale Touch-me-not
Palegreen Orchid
Paleleaf Woodland Sunflower
Palespike Lobelia
Pallid Hoptree
Palmetto
Palmleaf Indian Breadroot
Palmleaf Poppymallow
Panicgrass
Panicled False Indigo
Panicledleaf Ticktrefoil
Paperflower
Paradox Cinquefoil
Parrot Feather Watermilfoil
Parsley Hawthorn
Parsley Piert
Parsnip
Partridge Pea
Partridgeberry
Passionflower
Pasture Heliotrope
Patience Dock
Paulownia
Pawpaw
Pea
Peach
Peachleaf Willow
Pear
Pear Hawthorn
Pearl Millet
Pearlwort
Pecan
Pellitory