Pachysandra Pachysandra terminalis Box
Pale brittlestem (see Crumblecap, fringed)
Panellus, luminescent Panellus stypticus Gilled Mushrooms
Pansy, Field Viola kitaibelliana Violet
Parasol mushroom Macrolepiota procera Gilled Mushrooms
Parasol, shaggy Chlorophyllum Gilled Mushrooms
Parchment, crowded Stereum complicatum Miscellaneous Fungi
Parsnip, Cow Heracleum maximum Parsley
Parsnip, Meadow Thaspium trifoliatum Parsley
Parsnip, water Sium suave Parsley
Parsnip, Wild Pastinaca sativa Parsley
Partridge-Berry/ Two-Eyed Berry Mitchella repens Bedstraw (Madder)
Paulownia, royal (see Princess tree)
Pawpaw Asimina triloba Custard-apple
Pawpaw apple (see Pawpaw apple)
Pea, Canada (see Vetch, Cow/ Canada Pea/ Tufted Vetch)
Pea, Everlasting Lathyrus latifolius Pea
Pennycress, Field Thlaspi arvense Mustard
Pennyroyal, American Hedoma pulegioides Mint
Peony, Chinese (see Peony, garden)
Peony, garden Paeonia lactifolia Peony
Pepper Root (see Toothwort, Two Leaved/ Pepperwort/ Crinkleroot)
Pepper-and-salt (see Harbinger-of-Spring/ Pepper-and-Salt)
Peppergrass, Field (see Cress, Cow/ Field Pepper-Grass)
Peppergrass/ Poor-Man's-Pepper Lepidium virginicum Mustard
Peppermint Mentha piperita Mint
Pepperwort (see Toothwort, Two Leaved/ Pepperwort/ Crinkleroot)
Periwinkle/ Myrtle Vinca minor Dogbane
Pheasant's back mushroom (see Dryad's saddle)
Phlebia, radiating Phlebia radiata Crusts And Slimes
Phlox, Blue/ Wild Sweet William Phlox divaricata Phlox
Phlox, Downy Phlox pilosa Phlox
Phlox, Fall (see Phlox, Garden/ Fall Phlox)
Phlox, Garden/ Fall Phlox Phlox paniculata Phlox
Phlox, Meadow (see Sweet William, Wild/ Meadow Phlox)
Phlox, Moss/ Moss Pink Phlox subulata Phlox
Pholiota, sharp-scaly Pholiota squarrosioides Gilled Mushrooms
Pickerelweed Pontederia cordata Pickerelweed
Pignut (see Hickory, Pignut)
Pigweed, Rough Amaranthus retroflexus Amaranth
Pigweed, Slender/ Green Amaranth Amaranthus hybridus Amaranth
Pilewort/ Fireweed Erectites hieracifolia No Obvious Symmetry
Pine, Eastern White (see Pine, Northern White)
Pine, Gray (see Pine, Jack)
Pine, Ground (see Clubmoss, Staghorn)
Pine, Jack Pinus banksiana Pine
Pine, Northern White Pinus strobus Pine
Pine, Norway (see Pine, Red)
Pine, Red Pinus resinosa Pine
Pine, Running (see Clubmoss, Staghorn)
Pine, Scotch Pinus sylvestris Pine
Pine, Scrub Pinus virginiana Pine
Pine, Weymouth (see Pine, Northern White)
Pine, White (see Pine, Northern White)
Pineapple-Weed Matricaria matricarioides No Obvious Symmetry
Pinedrops Pterospora andromedea Fungus
Pink, Deptford Dianthus armeria Pink
Pink, Moss (see Phlox, Moss/ Moss Pink)
Pink, Mullein/ Rose Campion Lychnis coronaria Pink
Pink, Pennsylvania (see Pink, Wild/ Pennsylvania Pink)
Pink, Wild/ Pennsylvania Pink Silene caroliniana Pink
Pinwheel mushroom Marasmus rotula Gilled Mushrooms
Plane tree, American (see Sycamore, American)
Plantain, Common Plantago major Plantain
Plantain, English Plantago lanceolata Plantain
Plantain, Rattlesnake (see Orchid, Rattlesnake)
Platterful mushroom (see Broadgill)
Pleated pluteus Pluteus longistriatus Gilled Mushrooms
Pleurisy Root (see Butterfly-weed/ Pleurisy Root)
Poison Ivy Rhus radicans Cashew (Sumac)
Pokeweed Phytolacca americana Pokeweed
Polygonum, Pale (see Smartweed, Pale/ Pale Polygonum)
Polypody, common Polypodium vulgare Fern
Polypore, birch Piptoporus betulinus Mushrooms With Pores (Polypores)
Polypore, black footed Royoporus badius Mushrooms With Pores (Polypores)
Polypore, black stainiing Meripilus sumstinei Mushrooms With Pores (Polypores)
Polypore, bulbous
Polypore, cinnabar-red Pycnoporus cinnabarinus Mushrooms With Pores (Polypores)
Polypore, cracked-cap Phellinus robiniae Mushrooms With Pores (Polypores)
Polypore, elegant Polyporus badius Mushrooms With Pores (Polypores)
Polypore, hexagon-pored Polyporus alveolaris Mushrooms With Pores (Polypores)
Polypore, little nest Poronidulus conchifer Mushrooms With Pores (Polypores)
Polypore, milk-white toothed Irpex lacteus Mushrooms With Pores (Polypores)
Polypore, mustard-yellow Phellinus gilvus Mushrooms With Pores (Polypores)
Polypore, pheasant's back (see Earthball)
Polypore, red-belted Fomitopsis pinicola Mushrooms With Pores (Polypores)
Polypore, resinous Ischoderma resinosum Mushrooms With Pores (Polypores)
Polypore, spring Polyporus arcularius Mushrooms With Pores (Polypores)
Polypore, thick-maze oak (see Maze-gill, oak)
Polypore, tinder Fomes fomentarius Mushrooms With Pores (Polypores)
Polypore, violet-toothed Tricaptum biforme Mushrooms With Pores (Polypores)
Polypore, white-cheese Tyromyces chioneus Mushrooms With Pores (Polypores)
Polypore, winter Polyporus brumalis Mushrooms With Pores (Polypores)
Polypore, yellow-red Gloeophyllum septarium Mushrooms With Pores (Polypores)
Poor-Man's-Pepper (see Peppergrass/ Poor-Man's-Pepper)
Poplar, Balsam Populus balsamifera Willow
Poplar, Carolina (see Cottonwood, eastern)
Poplar, gray Populus canescens Willow
Poplar, necklace (see Cottonwood, eastern)
Poplar, Tulip (see Tulip Tree/ Tulip Poplar/ Yellow Poplar)
Poplar, Yellow (see Tulip Tree/ Tulip Poplar/ Yellow Poplar)
Potato, Duck (see Arrowhead, Broad-leaved/ Duck Potato/ Wapato)
Potato-Vine, Wild Ipomoea pandurata Morning Glory
Powdered ruffle lichen Parmotrema hypotropum Lichen
Powderhorn, common Cladonia conocracea Lichen
Powderhorn, smooth footed Cladonia ochrochlora Lichen
Pride of India (see Golden-Rain Tree)
Princess tree Paulownia tomentosa Snapdragon (Figwort)
Privit Ligustrum vulgare Olive
Privit, border Ligustrum obtusifolium Olive
Privit, regel (see Privit, border)
Psathyrella, common (see Crumblecap, fringed)
Puffball, gem-studded Lycoperdon perlatum Puffballs
Puffball, giant Calvatia gigantea Puffballs
Puffball, pear-shaped Morganella pyriformis Puffballs
Puffball, pigskin poison Scleroderma citrinum Puffballs
Puffball, skull shaped Calvatia craniiformis Puffballs
Puffball, vase Calvatia cyathiformis Puffballs
Purple bloom russula Russula mariae Gilled Mushrooms
Purslane Portulaca oleracea Purslane
Purslane, Milk Euphorbia supina Spurge
Pussytoes, Field Antennaria neglecta No Obvious Symmetry
Pussytoes, Plantain-Leaved Antennaria plantaginifolia No Obvious Symmetry
Pyrola, Round-Leaved/ Shinleaf Pyrola rotundiflora Wintergreen
Pyxie cups Cladonia pyxidata Lichen
Zizia aurea
Angelica atropurpurea
Osmorhiza longistylus
Osmorhiza claytoni
Erigenia bulbosa
Conium maculatum
Cryptotaenia canadensis
Imperatoria ostruthium
Heracleum maximum
Thaspium trifoliatum
Sium suave
Pastinaca sativa
Daucus carota
Sanicula canadensis
Sanicula trifolia
Cicuta maculata
Medicago sativa
Phaseolus polystachios
Trifolium agrarium
Trifolium dubium
Trifolium arvense
Trifolium, pratense
Trifolium procumbens
Trifolium repens
Melilotus alba
Melilotus officinalis
Amphicarpa bracteata
Lespedeza cuneata
Robina pseudo-acacia
Gleditsia triacanthos
Lupinus perennis
Lathyrus latifolius
Cassia hebecarpa
Desmodium glabellum
Desmodium canescens
Desmodium cuspidatum
Desmodium paniculatum
Desmodium canadense
Lotus corniculatus
Vicia cracca
Coronilla varia
Paeonia lactifolia
Phlox divaricata
Phlox pilosa
Phlox paniculata
Phlox subulata
Phlox maculata
Polemonium reptans
Pontederia cordata
Tsuga canadensis
Larix decidua
Pinus banksiana
Pinus strobus
Pinus resinosa
Pinus sylvestris
Pinus virginiana
Picea pungens
Picea abies
Picea glauca
Saponaria officinalis
Silene stellata
Silene noctiflora
Cerastium vulgatum
Stelleria media
Stellaria aquatica
Stellaria longifolia
Cerastium viscosum
Stellaria pubera
Lychnis alba
Dianthus armeria
Lychnis coronaria
Silene caroliniana
Arenaria serpyllifolia
Stellaria alsine
Stellaria graminea
Plantago major
Plantago lanceolata
Phytolacca americana
Dicentra eximia
Sanguinaria canadensis
Chelidonium majus
Stylophorum diphyllum
Corydalis flavula
Dicentra cucularia
Dicentra canadensis
Lysimachea ciliata
Lysimachea quadrifolia
Lysimachia terrestris
Lysimachia nummularia
Trientalis borealis
Portulaca oleracea
Claytonia virginica
Claytonia caroliniana