Pachysandra
Pagoda-plant
Painted Buckeye
Painted Trillium
Pale Beaksedge
Pale Beardtongue
Pale Dock
Pale False Mannagrass
Pale Grasspink
Pale Indian Plantain
Pale Purple Coneflower
Pale St. Johnswort
Pale Touch-me-not
Palegreen Orchid
Paleleaf Woodland Sunflower
Palespike Lobelia
Paleyellow Iris
Palmetto
Panhandle Lily
Panicgrass
Panicled Hydrangea
Panicledleaf Ticktrefoil
Paper Birch
Paradise Apple
Paraguayan Purslane
Paraguayan Starbur
Parasol Sedge
Parasol Whitetop
Parasoltree
Parrot Feather Watermilfoil
Parsley
Parsley Hawthorn
Parsley Piert
Parsnip
Partridge Pea
Partridgeberry
Passionflower
Pasture Spikesedge
Pasture Thistle
Patience Dock
Paulownia
Pawpaw
Paxistima
Pea