Pagoda-Plant, Downy
Pagoda-Plant, Hairy
Pale Jewelweed
Pale Smartweed
Pale-Spiked Lobelia
Paleseed, Narrowleaf
Palespike Lobelia
Palm Sedge
Panicgrass
Panicgrass, Bosc's
Panicgrass, Fall
Panicled Aster
Panicled Tick Trefoil
Panicledleaf Ticktrefoil
Panicum, Beaked
Pansy, European Field
Pansy, Garden
Pansy, Wild
Paperbark Maple
Parasol Whitetop
Parsley
Parsley, Japanese Hedge
Parsnip
Partridge Pea
Paspalum, Field
Paspalum, Florida
Paspalum, Hairyseed
Passionflower, Purple
Passionflower, Yellow
Pasture Rose
Pasture Spikesedge
Path Rush
Paulownia, Royal
Pawpaw
Pea, Everlasting
Pea, Flat
Pea, Partridge
Peanut, American Hog
Peanut, Hog
Pear, Bradford
Pear, Callery
Pear, Common
Pecan
Pennsylvania Bitter Cress
Pennsylvania Sedge
Pennsylvania Smartweed
Pennycress, Garlic
Pennycress, Perfoliate
Peony, Common
Pepper and Salt
Pepperbush, Sweet
Peppergrass, Common
Peppergrass, Field
Peppermint
Peppermint Surprise Lily
Pepperweed, Field
Pepperweed, Virginia
Perennial Sowthistle
Perfoliate Bellwort
Perfoliate Pennycress
Perilla Mint
Perilla, Purple
Periwinkle, Common
Periwinkle, Greater
Persian Speedwell
Persimmon
Petticoat-climber
Petunia, Smooth Wild
Petunia, Wild
Pheasant's Eye
Philadelphia Fleabane
Phlox, Creeping
Phlox, Fall
Phlox, Garden
Phlox, Moss
Phlox, Summer
Phlox, Tall
Phlox, Wild Blue
Pickerelweed
Pignut Hickory
Pigweed, Green
Pilewort
Pimpernel, False
Pimpernel, Savannah False
Pimpernel, Scarlet
Pimpernel, Water
Pimpernel, Yellow
Pin Oak
Pine, Austrian
Pine, Eastern White
Pine, Pitch
Pine, Red
Pine, Scotch
Pine, Scrub
Pine, Virginia
Pine, White
Pineapple Sage
Pineland Threeseed Mercury
Pink Evening Primrose
Pink Ivy-Leaved Speedwell
Pink Lily of the Valley
Pink Redstem
Pink, Deptford
Pink, Fire
Pinkweed
Pipe, Dutchman's
Pipe, Indian
Pipe, Virginia Dutchman's
Pipevine
Pitch Pine
Plains Coreopsis
Plant, Beefsteak
Plant, Chameleon
Plant, Compass
Plant, Cup
Plant, Lead
Plant, Obedient
Plant, Tattoo
Plantain, American
Plantain, American Water
Plantain, Blackseed
Plantain, Broadleaf
Plantain, Common
Plantain, English
Plantain, Narrowleaf
Plantain, Northern Water
Plantain, Rugel's
Plantain, Southern Water
Plantain-Leaved Pussytoes
Plantainleaf Sedge
Pointed Broom Sedge
Pointed-Leaved Tick Trefoil
Pointedleaf Ticktrefoil
Poison Hemlock
Poison Ivy
Pokeweed
Pond-Lily, Yellow
Pondweed, Diverse-Leaved
Pondweed, Longleaf
Pondweed, Sago
Pondweed, Slender
Pondweed, Waterthread
Poplar, Tulip
Poppy, California
Poppy, Celandine
Poppy, Common
Poppy, Corn
Poppy, Field
Potato, Duck
Potatobean
Prairie Cordgrass
Prairie Coreopsis
Prairie Dock
Prairie Dropseed
Prairie Fleabane
Prairie Milkweed
Prairie Mimosa
Prairie Rosinweed
Prairie Sedge
Prairie Trillium
Prickly Ash
Prickly Gooseberry
Prickly Lettuce
Prickly Mallow
Prickly Sedge
Prickly Sida
Prickly Sowthistle
Pride of Ohio
Pride, Venus'
Primrose, Evening
Primrose, Pink Evening
Princess Tree
Privet
Privet, Common
Prostrate Sandmat
Prostrate Spurge
Pumpkin, Field
Purple Bergamot
Purple Cliffbrake
Purple Coneflower
Purple Cress
Purple Dead-Nettle
Purple False Foxglove
Purple Foxglove
Purple Giant Hyssop
Purple Loosestrife
Purple Love Grass
Purple Passionflower
Purple Perilla
Purple Rocket
Purple Twayblade
Purple-Leaf Willowherb
Purple-Node Joe-Pye Weed
Purple-Stem Beggarticks
Purpletop
Purpletop Tridens
Purpletop Vervain
Purse, Shepherd's
Purslane Speedwell
Purslane, Common
Purslane, Marsh
Purslane, Water
Pussy Willow
Pussytoes
Pussytoes, Plantain-Leaved