Canada's Plant Hardiness Site
Pages A B C D E F G H I J K L M N O P Q R S T U V W X Y ZPachysandra procumbens Alleghany spurge
Pachysandra terminalis Japanese spurge
Parthenocissus quinquefolia Virginia creeper
Parthenocissus tricuspidata Boston ivy
Paulownia tomentosa princess tree
Phellodendron amurense Amur corktree
Philadelphus coronarius sweet mockorange
Photinia x fraseri fraser photinia
Physocarpus monogynus mountain ninebark
Physocarpus opulifolius eastern ninebark
Picea breweriana Brewer spruce
Picea engelmannii Engelmann spruce
Picea glauca white spruce
Picea mariana black spruce
Picea pungens blue spruce
Picea rubens red spruce
Picea sitchensis Sitka spruce
Pieris floribunda flutterbush
Pieris japonica Japanese pieris
Pinckneya bracteata fevertree
Pinus albicaulis whitebark pine
Pinus aristata Rocky Mountain bristlecone pine
Pinus cembroides piñon pine
Pinus edulis Colorado pinyon
Pinus monophylla singleleaf piñon
Pinus contorta lodgepole pine
Pinus echinata shortleaf pine
Pinus flexilis limber pine
Pinus jeffreyi Jeffrey pine
Pinus monticola western white pine
Pinus nigra Austrian pine
Pinus ponderosa Ponderosa pine
Pinus resinosa red pine
Pinus rigida pitch pine
Pinus strobus eastern white pine
Pinus sylvestris Scots pine
Pinus taeda loblolly pine
Pinus virginiana Virginia pine
Pistacia chinensis Chinese pistache
Platanus occidentalis American sycamore
Populus x acuminata lance-leaf cottonwood
Populus alba white poplar
Populus angustifolia narrow-leaf cottonwood
Populus balsamifera balsam poplar
Populus grandidentata bigtooth aspen
Populus tremuloides trembling aspen
Prunus americana American plum
Prunus avium mazzard cherry
Prunus caroliniana Carolina cherry-laurel
Prunus cerasifera cherry plum
Prunus cerasus sour cherry
Prunus emarginata bitter cherry
Prunus lusitanica Portugese laurel
Prunus maritima beach plum
Prunus nigra Canada plum
Prunus padus European bird cherry
Prunus pensylvanica pin cherry
Prunus persica peach
Prunus serotina black cherry
Prunus serrulata Mt. Fuji cherry
Prunus subhirtella weeping Higan cherry
Prunus tomentosa Nanking cherry
Ptelea trifoliata common hop-tree
Pyracantha coccinea scarlet firethorn
Pyracantha koidzumii formosa firethorn
Pyracantha fortuneana Chinese firethorn
Pyrus calleryana Callery pear
Pyrus communis common pear
Pseudofumaria lutea golden corydalis
Pilosella aurantiaca orange hawkweed
Paeonia lactiflora Chinese peony
Panicum virgatum old switch panicgrass
Papaver orientale Oriental poppy
Penstemon fruticosus shrubby beardtongue
Penstemon heterophyllus blue beardtongue
Penstemon hirsutus hairy beardtongue
Penstemon strictus Rocky Mountain beardtongue
Petrorhagia saxifraga saxifrage pink
Phalaris arundinacea reed canarygrass
Phlox divaricata wild blue phlox
Phlox glaberrima smooth phlox
Phlox maculata spotted phlox
Phlox paniculata garden phlox
Phlox stolonifera creeping phlox
Phlox subulata moss phlox
Physostegia virginiana Virginia false dragonhead
Platycodon grandiflorus balloon flower
Podophyllum peltatum May-apple
Polemonium caeruleum blue Jacob's-ladder
Polemonium reptans var. reptans creeping Jacob's-ladder
Polygonatum biflorum giant Solomon's seal
Polygonatum multiflorum Eurasian Solomon's seal
Polystichum acrostichoides Christmas fern
Polystichum braunii Braun's hollyfern
Polystichum munitum western sword fern
Potentilla thurberi scarlet cinquefoil
Primula vulgaris English primrose
Primula japonica candelabra primula
Primula veris English cowslip
Pseudosasa japonica arrow bamboo
Pulmonaria saccharata Bethlehem lungwort
Puschkinia scilloides striped squill
Pycnanthemum muticum mountain mint
Pycnanthemum virginianum Virginia mountain mint
Paraserianthes lophantha crested wattle
Parthenium integrifolium wild quinine
Parthenocissus inserta thicket creeper
Passiflora incarnata purple passionflower
Paxistima myrsinites false-box
Pediocactus simpsonii Simpson's hedgehog cactus
Penstemon digitalis foxglove beardtongue
Penstemon gracilis slender beardtongue
Petalostemon candidum white prairie clover
Petalostemon purpureum purple prairie clover
Phlox pilosa downy phlox
Phyllodoce aleutica Aleutian mountainheath
Phyllodoce empetriformis pink mountain heather
Physocarpus capitatus Pacific ninebark
Physocarpus malvaceus mallow-leaf ninebark
Platycladus orientalis Chinese arborvitae
Plumeria rubra frangipani
Poa alpina alpine bluegrass
Poa secunda Sandberg's bluegrass
Prunus domestica Damson plum
Pediomelum esculentum breadroot scurf-pea
Purshia tridentata antelope-brush
Pycnanthemum verticillatum whorled mountain-mint
Pteridium aquilinum eastern bracken fern
Polystichum lonchitis northern holly fern
Polypodium appalachianum Appalachian polypody
Phegopteris connectilis northern beech fern
Phegopteris hexagonoptera broad beech fern
Picea abies Norway spruce
Pinus banksiana jack pine
Pinus mugo mugo pine
Prosartes lanuginosa yellow fairybells
Prosartes trachycarpa rough-fruit fairybells
Platanthera aquilonis northern green bog orchid
Platanthera clavellata club-spur orchid
Platanthera huronensis Lake Huron green bog orchid
Platanthera lacera ragged fringed orchid
Platanthera orbiculata large round-leaf orchid
Platanthera psycodes small purple fringed orchid
Pogonia ophioglossoides rose pogonia
Panicum capillare old panic grass
Panicum miliaceum proso millet
Poa alsodes grove bluegrass
Poa arctica arctic bluegrass
Poa saltuensis old pasture bluegrass
Poa trivialis rough bluegrass
Puccinellia pumila dwarf alkaligrass
Puccinellia distans spreading alkaligrass
Puccinellia nutkaensis Nootka alkaligrass
Puccinellia nuttalliana Nuttall's alkaligrass
Puccinellia phryganodes creeping alkaligrass
Potamogeton amplifolius large-leaf pondweed
Potamogeton confervoides alga pondweed
Potamogeton crispus curly-leaf pondweed
Potamogeton epihydrus ribbon-leaf pondweed
Potamogeton foliosus leafy pondweed
Potamogeton friesii Fries' pondweed
Potamogeton natans floating-leaf pondweed
Potamogeton oakesianus Oakes' pondweed
Potamogeton obtusifolius blunt-leaf pondweed
Potamogeton perfoliatus clasping-leaf pondweed
Potamogeton praelongus longstalk pondweed
Potamogeton pusillus small pondweed
Potamogeton spirillus spiral pondweed
Potamogeton strictifolius straight-leaf pondweed
Potamogeton zosteriformis flat-stem pondweed
Panax quinquefolius Canadian ginseng
Panax trifolius groundnut
Pilosella officinarum mouse-ear hawkweed
Pilosella piloselloides tall hawkweed
Packera indecora rayless mountain groundsel
Packera obovata roundleaf groundsel
Packera paupercula balsam groundsel
Petasites frigidus arctic sweet coltsfoot
Plagiobothrys scouleri Scouler's popcornflower
Polanisia dodecandra common clammyweed
Paxistima canbyi Canby's mountain-lover
Penthorum sedoides ditch stonecrop
Pterospora andromedea pinedrops
Pyrola asarifolia pink pyrola
Pyrola chlorantha green-flowered pyrola
Phacelia franklinii Franklin's phacelia
Pedicularis flammea red-tipped lousewort
Pedicularis labradorica Labrador lousewort
Pedicularis sudetica Sudetic wood betony
Parnassia kotzebuei Kotzebue's grass-of-Parnassus
Plantago rugelii Rugel's plantain
Platanus x hispanica London planetree
Polygaloides paucifolia fringed milkwort
Persicaria amphibia water smartweed
Persicaria careyi Carey's smartweed
Persicaria hydropiper marsh water-pepper
Persicaria lapathifolia nodding smartweed
Persicaria maculosa spotted lady's-thumb
Persicaria sagittata arrow-leaf tearthumb
Polygonum achoreum leathery knotweed
Polygonum aviculare prostrate knotweed
Polygonum fowleri Fowler's knotweed
Primula egaliksensis Greenland primrose
Primula mistassinica Mistassini primrose
Potentilla anserina silverweed
Potentilla crantzii alpine cinquefoil
Potentilla hippiana Hipp's cinquefoil
Prunus armeniaca apricot
Prunus laurocerasus cherry laurel
Populus x canadensis Canadian poplar
Populus x canescens gray poplar
Populus x jackii Jack's hybrid poplar
Parthenocissus vitacea false Virginia creeper
Pastinaca sativa wild parsnip
Petroselinum crispum garden parsley
Pilosella x floribunda pale hawkweed
Packera aurea golden groundsel
Packera pauciflora few-flowered groundsel
Pseudognaphalium macounii Macoun's cudweed
Pyrrocoma lanceolata lanceleaf goldenweed
Phyllodoce caerulea purple mountain heather
Pyrola americana round-leaf pyrola
Pyrola elliptica shinleaf
Pyrola grandiflora arctic pyrola
Pyrola minor lesser wintergreen
Proserpinaca palustris marsh mermaidweed
Philadelphus pubescens hoary mockorange
Perilla frutescens beefsteak plant
Physostegia parviflora western false dragonhead
Prunella vulgaris self-heal
Pycnanthemum tenuifolium slender mountain-mint
Pinguicula villosa hairy butterwort
Pinguicula vulgaris common butterwort
Pedicularis canadensis Canada lousewort
Pedicularis groenlandica elephant's-head lousweort
Pedicularis lanceolata swamp lousewort
Pedicularis lapponica Lapland lousewort
Pedicularis parviflora small-flower lousewort
Parnassia glauca fen grass-of-Parnassus
Parnassia parviflora small-flower grass-of-Parnassus
Phytolacca americana American pokeweed
Plantago lanceolata English plantain
Plantago major common plantain
Plantago maritima seaside plantain
Plantago media hoary plantain
Phlox drummondii Drummond's phlox
Persicaria pensylvanica Pennsylvania smartweed
Persicaria punctata dotted smartweed
Persicaria virginiana jumpseed
Polygonum douglasii Douglas' knotweed
Polygonum erectum erect knotweed
Polygonum ramosissimum bushy knotweed
Portulaca grandiflora moss rose
Portulaca oleracea common purslane
Primula incana mealy primrose
Primula laurentiana Laurentian primrose
Primula stricta strict primrose
Potentilla argentea silvery cinquefoil
Potentilla canadensis Canada cinquefoil
Potentilla gracilis slender cinquefoil
Potentilla bimundorum staghorn cinquefoil
Potentilla nana dwarf cinquefoil
Potentilla nivea snowy cinquefoil
Potentilla norvegica rough cinquefoil
Potentilla pensylvanica Pensylvania cinquefoil
Potentilla pulchella pretty cinquefoil
Potentilla recta sulphur cinquefoil
Potentilla simplex oldfield cinquefoil
Prunus pumila sand cherry
Prunus virginiana chokecherry
Poteridium annuum prairie burnet
Populus deltoides eastern cottonwood
Populus nigra black poplar
Petunia x hybrida garden petunia
Physalis heterophylla clammy ground cherry
Parietaria pensylvanica Pennsylvania pellitory
Pilea pumila dwarf clearweed
Polypodium virginianum rock polypody
Pellaea atropurpurea purple-stem cliffbrake
Pellaea glabella smooth cliffbrake
Pseudotsuga menziesii Douglas fir
Platanthera dilatata tall white bog orchid
Platanthera unalascensis Alaskan rein orchid
Platanthera grandiflora large purple fringed orchid
Platanthera hookeri Hooker's orchid
Platanthera macrophylla greater round-leaf orchid
Platanthera obtusata subsp. obtusata blunt-leaf orchid
Phalaris canariensis annual canarygrass
Phleum alpinum alpine timothy
Phleum pratense timothy
Phragmites australis common reed
Piptatherum canadense Richardson's feathergrass
Poa annua annual bluegrass
Poa compressa wiregrass
Poa glauca glaucous bluegrass
Poa interior interior bluegrass
Poa nemoralis woodland bluegrass
Poa palustris fowl bluegrass
Poa pratensis Kentucky bluegrass
Pontederia cordata pickerelweed
Potamogeton alpinus alpine pondweed
Potamogeton gramineus grass-leaf pondweed
Potamogeton illinoensis Illinois pondweed
Potamogeton nodosus long-leaf pondweed
Potamogeton richardsonii Richardson's pondweed
Potamogeton robbinsii Robbins' pondweed
Potamogeton vaseyi Vasey's pondweed
Polygonatum pubescens hairy Solomon's seal
Prunus susquehanae Susquehana sand cherry
Packera plattensis prairie groundsel
Packera pseudaurea streambank groundsel
Pseudognaphalium obtusifolium fragrant cudweed
Panicum flexile wiry witchgrass
Polypodium sibiricum Siberian polypody
Panicum philadelphicum Philadelphia panicgrass
Phryma leptostachya var. leptostachya American lopseed; Fr: phryma à épis grêles
Persicaria minor pygmy smartweed
Persicaria hydropiperoides mild water-pepper
Physalis longifolia long-leaf ground-cherry
Potentilla bipinnatifida plains cinquefoil
Peltandra virginica green arrow arum
Potamogeton hillii Hill's pondweed
Populus x rouleauana Rouleau's hybrid poplar
Papaver rhoeas corn poppy
Papaver somniferum opium poppy
Potentilla inclinata ashy cinquefoil
Phedimus aizoon aizoon stonecrop
Philadelphus lewisii Lewis' mockorange
Poa sylvestris woodland bluegrass
Potentilla intermedia downy cinquefoil
Potentilla rivalis brook cinquefoil
Pinus elliottii slash pine
Pinus attenuata knobcone pine
Pinus balfouriana foxtail pine
Pinus clausa sand pine
Pinus coulteri Coulter pine
Pinus engelmannii Apache pine
Pinus glabra spruce pine
Pinus lambertiana sugar pine
Pinus leiophylla smooth-leaf pine
Pinus longaeva Great Basin bristlecone pine
Pinus palustris longleaf pine
Pinus pungens Table Mountain pine
Pinus radiata Monterey pine
Pinus sabiniana gray pine
Pinus serotina pond pine
Pinus strobiformus southwestern white pine
Platanus racemosa western sycamore
Populus heterophylla swamp cottonwood
Pseudotsuga macrocarpa bigcone Douglas fir
Planera aquatica water elm
Prosopis glandulosa honey mesquite
Prosopis velutina velvet mesquite
Prosopis pubescens screwpod
Pinus muricata bishop pine
Poa bulbosa bulbous bluegrass
Perideridia gairdneri false caraway
Pimpinella saxifraga solidstem burnet saxifrage
Pinellia ternata crowdipper
Prosartes hookeri Hooker's fairybells
Prosartes smithii Smith's fairybells
Platanthera elegans elegant rein orchid
Platanthera elongata tall rein orchid
Platanthera transversa royal rein orchid
Platanthera blephariglottis white fringed orchid
Platanthera chorisiana Chamisso's orchid
Platanthera ciliaris yellow fringed orchid
Platanthera flava southern rein orchid
Platanthera leucophaea prairie fringed orchid
Platanthera praeclara western prairie fringed orchid
Platanthera stricta slender bog orchid
Potamogeton bicupulatus snail-seed pondweed
Potamogeton diversifolius water-thread pondweed
Potamogeton pulcher spotted pondweed
Phyllospadix scouleri Scouler's surfgrass
Phyllospadix torreyi Torrey's surfgrass
Pectocarya penicillata winged combseed
Pentaglottis sempervirens evergreen bugloss
Plagiobothrys leptocladus fine-branched popcornflower
Plagiobothrys tenellus Pacific popcornflower
Panicum dichotomiflorum fall panicgrass
Paspalum setaceum slender paspalum
Phalaris minor lesser canarygrass
Phippsia algida icegrass
Piptatherum exiguum little ricegrass
Piptatherum racemosum mountain ricegrass
Poa abbreviata abbreviated bluegrass
Poa arida plains bluegrass
Poa cusickii Cusick's bluegrass
Poa fendleriana Fendler's bluegrass
Poa howellii Howell's bluegrass
Poa infirma weak bluegrass
Poa laxiflora lax-flower bluegrass
Poa leptocoma western bog bluegrass
Poa lettermanii Letterman's bluegrass
Poa nervosa nerved bluegrass
Poa paucispicula few-flower bluegrass
Poa pseudoabbreviata polar bluegrass
Poa stenantha narrow-flowered bluegrass
Poa wheeleri Wheeler's bluegrass
Polypogon monspeliensis annual rabbit's-foot grass
Puccinellia andersonii Anderson's alkaligrass
Puccinellia angustata narrow alkaligrass
Puccinellia arctica arctic alkaligrass;
Puccinellia bruggemannii Bruggemann's alkaligrass
Puccinellia vaginata tussock alkaligrass
Puccinellia vahliana Vahl's alkaligrass
Parapholis incurva curved sicklegrass
Piptochaetium avenaceum blackseed speargrass
Pleuropogon refractus nodding semaphoregrass
Pleuropogon sabinei Sabine's semaphoregrass
Podagrostis aequivalvis Arctic bent
Podagrostis humilis alpine bentgrass
Psathyrostachys juncea Russian wild rye
Parnassia fimbriata fringed grass-of-Parnassus
Phlox caespitosa tufted phlox
Phlox hoodii Hood's phlox
Phlox longifolia long-leaf phlox
Phlox richardsonii Richardson's phlox
Phlox speciosa showy phlox
Polemonium acutiflorum tall Jacob's-ladder
Polemonium elegans elegant Jacob's-ladder
Polemonium micranthum annual Jacob's-ladder
Polemonium occidentale western Jacob's-ladder
Polemonium pulcherrimum showy Jacob's-ladder
Polemonium vanbruntiae Van Brunt's Jacob's-ladder
Polemonium viscosum sticky Jacob's-ladder
Persicaria arifolia halberd-leaf tearthumb
Persicaria longiseta long-bristle smartweed
Persicaria orientalis prince's-feather
Persicaria robustior stout smartweed
Polygonum austiniae Austin's knotweed
Polygonum majus wiry knotweed
Polygonum minimum dwarf knotweed
Polygonum paronychia beach knotweed
Polygonum polygaloides milkwort knotweed
Polygonum sawatchense Sawatch knotweed
Polygonum spergulariiforme spurry knotweed
Podostemum ceratophyllum horn-leaf riverweed
Papaver dubium long-head poppy
Parnassia palustris marsh grass-of-Parnassus
Penstemon albertinus Alberta beardtongue
Penstemon albidus white beardtongue
Penstemon calycosus long-sepal beardtongue
Penstemon confertus lesser yellow beardtongue
Penstemon davidsonii Davidson's penstemon
Penstemon ellipticus elliptic-leaf beardtongue
Penstemon eriantherus fuzzy-tongue beardtongue
Penstemon gormanii Gorman's beardtongue
Penstemon lyallii Lyall's beardtongue
Penstemon nitidus smooth blue beardtongue
Penstemon ovatus ovate-leaf beardtongue
Penstemon pallidus pale beardtongue
Penstemon procerus small-flower beardtongue
Penstemon pruinosus Chelan beardtongue
Penstemon richardsonii Richardson's beardtongue
Penstemon serrulatus Cascade beardtongue
Plantago aristata large-bract plantain
Plantago canescens hairy plantain
Plantago cordata heart-leaf plantain
Plantago coronopus buckhorn plantain
Plantago eriopoda alkali plantain
Plantago macrocarpa Alaska plantain
Plantago patagonica woolly plantain
Plantago virginica Virginia plantain
Proboscidea louisiana Lousiana unicorn plant
Parrya arctica
Parrya nudicaulis
Physaria arctica arctic bladderpod
Physaria arenosa sand bladderpod
Physaria didymocarpa double twinpod
Physaria spatulata spatulateleaf bladderpod
Polystichum andersonii Anderson's holly fern
Polystichum californicum California swordfern
Polystichum imbricans narrowleaf swordfern
Polystichum kruckebergii Kruckeberg's hollyfern
Polystichum lemmonii Lemmon's holly fern
Polystichum scopulinum mountain holly fern
Polypodium amorphum irregular polypody
Polypodium glycyrrhiza licorice fern
Polypodium hesperium western polypody
Polypodium scouleri leathery polypody
Pentagramma triangularis goldenback fern
Potentilla pulcherrima beautiful cinquefoil
Potentilla reptans creeping cinquefoil
Potentilla rubricaulis red-stem cinquefoil
Potentilla subgorodkovii Jurtzev's potentilla
Potentilla subjuga Colorado cinquefoil
Potentilla subvahliana high arctic cinquefoil
Potentilla vahliana Vahl's cinquefoil
Potentilla villosa villous cinquefoil
Potentilla villosula Alaskan cinquefoil
Potentilla vulcanicola Kamtchatka cinquefoil
Prunus mahaleb mahaleb cherry
Prunus spinosa blackthorn
Pediomelum argophyllum silver-leaf scurf-pea
Phaseolus coccineus scarlet runner bean
Phaseolus vulgaris garden bean
Pueraria montana kudzu
Pityopsis falcata sickle-leaf goldenaster
Pyrrocoma carthamoides large-flower goldenweed
Pyrrocoma uniflora one-flower goldenweed
Pluchea odorata shrubby camphorweed
Polymnia canadensis white-flower leafcup
Pycnanthemum incanum hoary mountain-mint
Proserpinaca pectinata combleaf mermaidweed
Packera cana woolly groundsel
Packera glabella butterweed
Packera hyperborealis boreal groundsel
Packera macounii Macoun’s groundsel
Packera ogotorukensis Ogotoruk Creek ragwort
Packera schweinitziana Schweinitz's groundsel
Packera streptanthifolia Rocky Mountain groundsel
Packera subnuda alpine meadow groundsel
Picris hieracioides hawkweed oxtongue;
Pseudognaphalium stramineum cotton-batting cudweed
Parentucellia viscosa
Pedicularis arctoeuropaea
Pedicularis bracteosa bracted lousewort
Pedicularis capitata large-flower lousewort
Pedicularis contorta coiled-beak lousewort
Pedicularis hirsuta hairy lousewort
Pedicularis interior
Pedicularis lanata woolly lousewort
Pedicularis langsdorffii Langsdorff's lousewort
Pedicularis oederi Oeder's lousewort
Pedicularis ornithorhyncha
Pedicularis racemosa sickletop lousewort
Pedicularis verticillata whorled lousewort
Primula borealis northern primrose
Primula cuneifolia wedge-leaf primrose
Philadelphus inodorus
Psilocarphus brevissimus dwarf woollyheads
Psilocarphus elatior tall woollyheads
Psilocarphus tenellus slender woollyheads
Phyla lanceolata lance-leaved frogfruit
Plectritis congesta sea blush
Pilea fontana lesser clearweed
Paronychia canadensis smooth forked nailwort
Paronychia fastigiata hairy forked nailwort
Paronychia sessiliflora creeping nailwort
Petrorhagia prolifera proliferous pink
Polycarpon tetraphyllum four-leaf manyseed
Perideridia americana eastern yampah
Polytaenia nuttallii Nuttall's prairie parsley
Peltandra sagittifolia white arrow arum
Parthenium alpinum alpine feverfew
Pyrrocoma liatriformis Palouse goldenweed
Paronychia argyrocoma silvery nailwort
Parnassia grandifolia largeleaf grass-of-Parnassus
Prosartes maculata nodding mandarin
Phaseolus polystachios thicket bean
Pinguicula primuliflora southern butterwort
Platanthera cristata crested orange bog orchid
Platanthera integra golden fringeless orchid
Platanthera integrilabia
Platanthera peramoena purple fringeless orchid
Ponthieva racemosa hairy shadow witch
Penstemon canescens grey beardtongue
Penstemon cobaea prairie beardtongue
Penstemon lemhiensis Lemhi beardtongue
Penstemon oklahomensis Oklahoma penstemon
Poa paludigena bog bluegrass
Phlox bifida cleft phlox
Phoradendron leucarpum eastern mistletoe
Phemeranthus calcaricus limestone fameflower
Phemeranthus rugospermus prairie fameflower
Phemeranthus teretifolius quill fameflower
Phacelia linearis
Phacelia mollis
Phacelia purshii
Phacelia sericea
Phyllodoce x intermedia hybrid mountain heather
Phyllodoce glanduliflora yellow mountain heather
Pleuricospora fimbriolata fringed pinesap
Phacelia hastata
Polemonium villosissimum hairy Jacob's-ladder
Pyrola picta white-veined wintergreen
Platanthera hyperborea northern green orchid
Petrosedum forsterianum Forster’s stonecrop
Petrosedum rupestre crooked yellow stonecrop
Phedimus spurius two-row stonecrop
Pteridium latiusculum northern bracken fern
Pyrola aphylla leafless wintergreen
Pyrola dentata tooth-leaf wintergreen
Pycnanthemum flexuosum Appalachian mountain-mint
Proboscidea louisianica Lousiana unicorn plant
Platanthera ephemerantha white-flower rein orchid
Pedicularis ornithorhynchos bird's-beak lousewort
Penstemon cusickii Cusick's beardtongue
Penstemon tubaeflorus trumpet beardtongue
Panicum tuckermanii Tuckerman's panicgrass
Paspalum distichum Thompson grass
Patis racemosa blackseed ricegrass
Piptatheropsis canadensis Canadian ricegrass
Piptatheropsis exigua little ricegrass
Poa bolanderi Bolander's bluegrass
Poa leibergii Leiberg’s bluegrass
Poa macrocalyx large-glume bluegrass
Polypogon interruptus ditch beardgrass
Polypogon viridis water beardgrass
Puccinellia lemmonii Lemmon's alkaligrass
Phlox alaskensis Alaskan phlox
Polemonium californicum California Jacob's-ladder
Parogonum ciliinode fringed black bindweed
Persicaria perfoliata Asiatic tearthumb
Polygonum tenue slender knotweed
Potamogeton berchtoldii Berchtold's pondweed
Primula eximia arctic primrose
Pontederia crassipes floating water-hyacinth
Pellaea breweri Brewer's cliffbrake
Pulsatilla nuttalliana prairie pasqueflower
Pulsatilla occidentalis western pasqueflower
Physocarpus intermedius prairie ninebark
Potentilla anglica English cinquefoil
Potentilla arenosa subsp. arenosa bluff cinquefoil
Potentilla biennis biennial cinquefoil
Potentilla biflora two-flower cinquefoil
Potentilla brunnescens graceful brown cinquefoil
Potentilla concinna early cinquefoil
Potentilla drummondii Drummond's cinquefoil
Potentilla effusa branched cinquefoil
Potentilla elegans elegant cinquefoil
Potentilla flabellifolia fanfoil cinquefoil
Potentilla glaucophylla blue-leaf cinquefoil
Potentilla hyparctica arctic cinquefoil
Potentilla indica mock strawberry
Potentilla litoralis coastal cinquefoil
Potentilla macounii Macoun's cinquefoil
Potentilla ovina sheep cinquefoil
Potentilla ×pedersenii Pedersen's cinquefoil
Potentilla uniflora one-flower cinquefoil
Poterium sanguisorba salad burnet
Prunus umbellata flatwoods plum
Pectiantia pentandra five-stamen mitrewort
Petunia ×atkinsiana garden petunia
Physalis angulatla cut-leaf ground-cherry
Physalis grisea grey ground-cherry
Physalis peruviana Peruvian ground-cherry
Physalis philadelphica Philadelphia ground-cherry
Physalis pubescens downy ground-cherry
Physalis virginiana Virginia ground-cherry
Parietaria hespera western pellitory
Palustricodon aparinoides var. aparinoides marsh harebell
Pulmonaria officinalis common lungwort
Pseudognaphalium thermale slender cudweed
Piptatheropsis pungens slender ricegrass
Piptatheropsis micrantha small-flower ricegrass
Panicum gattingeri Gattinger's witchgrass
Pilosella caespitosa meadow hawkweed
Petasites japonicus
Picradeniopsis oppositifolia
Polygonum aviculare subsp. buxiforme box knotweed
Polygonum aviculare subsp. neglectum narrowleaf knotweed
Potentilla anserina subsp. groenlandica Greenland silverweed
Physostegia virginiana subsp. virginiana Virginia false dragonhead
Polygonum ramosissimum subsp. ramosissimum bushy knotweed
Potentilla norvegica subsp. monspeliensis
Ptelea trifoliata subsp. trifoliata common hop-tree
Populus balsamifera subsp. balsamifera balsam poplar
Populus deltoides subsp. deltoides eastern cottonwood
Populus deltoides subsp. monilifera plains cottonwood
Pellaea glabella subsp. glabella smooth cliffbrake
Poa arctica subsp. arctica arctic bluegrass
Poa pratensis subsp. pratensis Kentucky bluegrass
Potamogeton foliosus subsp. foliosus leafy pondweed
Panicum miliaceum subsp. miliaceum proso millet
Poa alpina subsp. alpina alpine bluegrass
Poa glauca subsp. glauca glaucous bluegrass
Poa glauca subsp. rupicola timberline bluegrass
Polygonum aviculare subsp. aviculare prostrate knotweed
Polygonum ramosissimum subsp. prolificum proliferous knotweed
Poa saltuensis subsp. languida weak bluegrass
Poa secunda subsp. secunda Sandberg's bluegrass
Poa secunda subsp. juncifolia alkali bluegrass
Potentilla supina subsp. paradoxa paradox cinquefoil
Populus deltoides subsp. wislizeni Rio Grande cottonwood
Pedicularis canadensis subsp. canadensis Canada woodbetony
Poa bulbosa subsp. vivipara viviparous bulbous bluegrass
Platanthera elegans subsp. elegans elegant rein orchid
Panicum dichotomiflorum subsp. dichotomiflorum fall panicgrass
Phragmites australis subsp. americanus American reed
Phragmites australis subsp. australis common reed
Poa abbreviata subsp. abbreviata abbreviated bluegrass
Poa cusickii subsp. epilis skyline bluegrass
Poa cusickii subsp. pallida Cusick's pale bluegrass
Poa fendleriana subsp. fendleriana Fendler's bluegrass
Poa fendleriana subsp. longiligula long-tongue muttongrass
Poa hartzii subsp. hartzii Hartz's bluegrass
Poa pratensis subsp. agassizensis Agassiz's bluegrass
Phlox drummondii subsp. drummondii Drummond's phlox
Phlox hoodii subsp. canescens spiny phlox
Phlox pilosa subsp. fulgida prairie phlox
Phlox pilosa subsp. pilosa downy phlox
Polemonium pulcherrimum subsp. lindleyi Lindley's Jabob's-ladder
Polemonium pulcherrimum subsp. pulcherrimum showy Jacob's-ladder
Polygonum polygaloides subsp. confertiflorum white-margin knotweed
Polygonum sawatchense subsp. oblivium sublime knotweed
Polygonum sawatchense subsp. sawatchense Sawatch knotweed
Polanisia dodecandra subsp. dodecandra common clammyweed
Polystichum imbricans subsp. imbricans narrow-leaf sword fern
Pellaea glabella subsp. simplex simple cliffbrake
Pentagramma triangularis subsp. triangularis goldenback fern
Prunus serotina subsp. serotina black cherry
Pinguicula vulgaris subsp. vulgaris common butterwort
Pedicularis langsdorffii subsp. arctica arctic lousewort
Primula cuneifolia subsp. saxifragifolia saxifrage-leaf primrose
Pyrola asarifolia subsp. asarifolia pink pyrola
Pyrola asarifolia subsp. bracteata long-bract pyrola
Potentilla anserina subsp. anserina common silverweed
Potentilla anserina subsp. pacifica Pacific silverweed
Polycarpon tetraphyllum subsp. tetraphyllum four-leaf manyseed
Pedicularis racemosa subsp. alba white sickletop lousewort
Pedicularis sudetica subsp. interior interior Sudetic lousewort
Pinus contorta var. contorta shore pine
Pinus contorta var. latifolia Rocky Mountain lodgepole pine
Prunus virginiana var. virginiana chokecherry
Prunus virginiana var. demissa western chokecherry
Pseudotsuga menziesii var. menziesii coast Douglas fir
Pseudotsuga menziesii var. glauca Rocky Mountain Douglas fir
Polygonatum biflorum subsp. commutatum giant Solomon's seal
Petasites frigidus var. palmatus palmate sweet coltsfoot
Petasites frigidus var. sagittatus arrow-leaf sweet coltsfoot
Prunella vulgaris var. lanceolata lance-leaf self-heal
Prunella vulgaris var. vulgaris self-heal heal-all
Potentilla gracilis var. gracilis slender cinquefoil
Potentilla hippiana var. hippiana
Prunus pumila var. besseyi Bessey's sand cherry
Prunus pumila var. depressa prostrate sand cherry
Prunus pumila var. pumila Great Lakes sand cherry
Pteridium aquilinum var. latiusculum eastern bracken
Platanthera dilatata var. dilatata tall white bog orchid
Pyrrocoma lanceolata var. lanceolata lance-leaf goldenweed
Packera pseudaurea var. semicordata heart-leaf groundsel
Plagiobothrys scouleri var. hispidulus harsh popcornflower
Pteridium aquilinum var. pubescens western bracken fern
Physalis longifolia var. subglabrata smooth ground-cherry