List of Canadian plants by family P–Q

Main page: List of Canadian plants by family

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Paeoniaceae

 * Paeonia brownii — western peony

Pallaviciniaceae

 * Moerckia blyttii
 * Moerckia hibernica
 * Pallavicinia lyellii — pallavicinia

Papaveraceae

 * Meconella oregana — white meconella
 * Papaver alboroseum — pale poppy
 * Papaver alpinum — dwarf poppy
 * Papaver dahlianum — polar poppy
 * Papaver gorodkovii — Russian poppy
 * Papaver lapponicum — Lapland poppy
 * Papaver macounii — Macoun's poppy
 * Papaver mcconnellii — McConnell's poppy
 * Papaver nudicaule — Icelandic poppy
 * Papaver pygmaeum — alpine glacier poppy
 * Papaver radicatum — Arctic poppy
 * Papaver walpolei — Walpole's poppy
 * Sanguinaria canadensis — bloodroot
 * Stylophorum diphyllum — celandine poppy

Pelliaceae

 * Pellia endiviifolia
 * Pellia epiphylla — common pellia
 * Pellia neesiana

Phytolaccaceae

 * Phytolacca americana — common pokeweed

Pinaceae

 * Abies amabilis — Pacific silver fir
 * Abies balsamea — balsam fir
 * Abies grandis — grand fir
 * Abies lasiocarpa — subalpine fir
 * Abies x phanerolepis
 * Larix laricina — tamarack
 * Larix lyallii — subalpine larch
 * Larix occidentalis — western larch
 * Picea engelmannii — Engelmann's spruce
 * Picea glauca — white spruce
 * Picea mariana — black spruce
 * Picea rubens — red spruce
 * Picea sitchensis — Sitka spruce
 * Picea x lutzii
 * Pinus albicaulis — whitebark pine
 * Pinus banksiana — jack pine
 * Pinus contorta — lodgepole pine
 * Pinus flexilis — limber pine
 * Pinus monticola — western white pine
 * Pinus ponderosa — ponderosa pine
 * Pinus resinosa — red pine
 * Pinus rigida — pitch pine
 * Pinus strobus — eastern white pine
 * Pinus x murraybanksiana
 * Pseudotsuga menziesii — Douglas-fir
 * Tsuga canadensis — eastern hemlock
 * Tsuga heterophylla — western hemlock
 * Tsuga mertensiana — mountain hemlock

Plagiochilaceae

 * Pedinophyllum interruptum
 * Plagiochila arctica
 * Plagiochila asplenioides
 * Plagiochila austinii
 * Plagiochila porelloides
 * Plagiochila satoi
 * Plagiochila schoefieldiana
 * Plagiochila semidecurrens

Plagiotheciaceae

 * Plagiothecium berggrenianum
 * Plagiothecium cavifolium
 * Plagiothecium denticulatum
 * Plagiothecium laetum
 * Plagiothecium latebricola — lurking leskea
 * Plagiothecium piliferum
 * Plagiothecium undulatum

Plantaginaceae

 * Littorella uniflora — American shoregrass
 * Plantago bigelovii — Bigelow's plantain
 * Plantago canescens — hairy plantain
 * Plantago cordata — heartleaf plantain
 * Plantago elongata — slender plantain
 * Plantago eriopoda — saline plantain
 * Plantago macrocarpa — Alaska plantain
 * Plantago maritima — seaside plantain
 * Plantago patagonica — woolly plantain
 * Plantago rugelii — blackseed plantain
 * Plantago tweedyi — Tweedy's plantain

Pleuroziaceae

 * Pleurozia purpurea

Pleuroziopsidaceae

 * Pleuroziopsis ruthenica

Plumbaginaceae

 * Armeria maritima — western thrift
 * Limonium carolinianum — sea-lavender

Poaceae

 * Achnatherum hymenoides — Indian mountain-ricegrass
 * Achnatherum lemmonii — Lemmon's needlegrass
 * Achnatherum nelsonii — Nelson's needlegrass
 * Achnatherum occidentale — western needlegrass
 * Achnatherum richardsonii — Canada mountain-ricegrass
 * Agrostis aequivalvis — northern bentgrass
 * Agrostis alascana — Alaska bentgrass
 * Agrostis clavata — clubbed bentgrass
 * Agrostis diegoensis — leafy bentgrass
 * Agrostis exarata — spike bentgrass
 * Agrostis geminata — hairgrass
 * Agrostis humilis — mountain bentgrass
 * Agrostis hyemalis — winter bentgrass
 * Agrostis idahoensis — Idaho bentgrass
 * Agrostis mertensii — Arctic bentgrass
 * Agrostis microphylla — small-leaf bentgrass
 * Agrostis oregonensis — Oregon bentgrass
 * Agrostis pallens — seashore bentgrass
 * Agrostis perennans — perennial bentgrass
 * Agrostis scabra — rough bentgrass
 * Agrostis stolonifera — creeping bentgrass
 * Agrostis thurberiana — Thurber's bentgrass
 * Agrostis variabilis — variable bentgrass
 * Alopecurus aequalis — shortawn foxtail
 * Alopecurus alpinus — mountain foxtail
 * Alopecurus carolinianus — tufted foxtail
 * Ammophila breviligulata — American beachgrass
 * Andropogon gerardi — big bluestem
 * Andropogon hallii — sand bluestem
 * Andropogon virginicus — common broom-sedge
 * Arctagrostis latifolia — broadleaf arctagrostis
 * Arctophila fulva — pendant-grass
 * Aristida basiramea — forked three-awn grass
 * Aristida dichotoma — Shinner's three-awn grass
 * Aristida longespica — slimspike three-awn grass
 * Aristida purpurascens — purple needlegrass
 * Aristida purpurea — purple three-awn grass
 * Beckmannia syzigachne — American sloughgrass
 * Bouteloua curtipendula — side-oats gramma
 * Bouteloua gracilis — blue gramma
 * Bouteloua hirsuta — hairy gramma
 * Brachyelytrum erectum — bearded shorthusk
 * Brachyelytrum septentrionale — northern shorthusk
 * Bromus anomalus — nodding brome
 * Bromus carinatus — California brome
 * Bromus ciliatus — fringed brome
 * Bromus inermis — awnless brome
 * Bromus kalmii — wild chess
 * Bromus latiglumis — broad-glumed brome
 * Bromus nottowayanus — Nottoway brome
 * Bromus pacificus — Pacific brome
 * Bromus porteri — Porter's chess
 * Bromus pubescens — hairy wood brome
 * Bromus sitchensis — Alaska brome
 * Bromus vulgaris — narrow-flowered brome
 * Buchloe dactyloides — buffalo grass
 * Calamagrostis canadensis — bluejoint reedgrass
 * Calamagrostis coarctata — Nuttall's reedgrass
 * Calamagrostis deschampsioides — circumpolar small-reedgrass
 * Calamagrostis holmii — Holm's small-reedgrass
 * Calamagrostis lapponica — Lapland reedgrass
 * Calamagrostis montanensis — plains reedgrass
 * Calamagrostis nutkaensis — Pacific small-reedgrass
 * Calamagrostis pickeringii — Pickering's reed bentgrass
 * Calamagrostis purpurascens — purple reedgrass
 * Calamagrostis rubescens — pine reedgrass
 * Calamagrostis sesquiflora — one-and-a-half-flower small-reedgrass
 * Calamagrostis stricta — slimstem small-reedgrass
 * Calamovilfa longifolia — sand reedgrass
 * Catabrosa aquatica — brook grass
 * Cenchrus longispinus — longspine sandbur
 * Chasmanthium latifolium — Indian sea-oats
 * Cinna arundinacea — stout wood reedgrass
 * Cinna latifolia — slender wood reedgrass
 * Coleanthus subtilis — moss grass
 * Danthonia californica — California oatgrass
 * Danthonia compressa — flattened oatgrass
 * Danthonia intermedia — Vasey's oatgrass
 * Danthonia parryi — Parry's oatgrass
 * Danthonia spicata — poverty oatgrass
 * Danthonia unispicata — few-flowered oatgrass
 * Deschampsia alpina — alpine hairgrass
 * Deschampsia beringensis — Bering hairgrass
 * Deschampsia brevifolia — shortleaf hairgrass
 * Deschampsia caespitosa — tufted hairgrass
 * Deschampsia danthonioides — annual hairgrass
 * Deschampsia elongata — slender hairgrass
 * Deschampsia flexuosa — wavy hairgrass
 * Deschampsia holciformis — Pacific hairgrass
 * Deschampsia mackenzieana — MacKenzie's hairgrass
 * Diarrhena americana — American beakgrain
 * Diarrhena obovata — beak grass
 * Dichanthelium acuminatum — tapered rosette grass
 * Dichanthelium boreale — northern witchgrass
 * Dichanthelium boscii — Bosc's witchgrass
 * Dichanthelium clandestinum — deer-tongue witchgrass
 * Dichanthelium depauperatum — starved witchgrass
 * Dichanthelium dichotomum — cypress witchgrass
 * Dichanthelium latifolium — broadleaf witchgrass
 * Dichanthelium leibergii — Leiberg's rosette grass
 * Dichanthelium leucothrix — roughish witchgrass
 * Dichanthelium linearifolium — slimleaf witchgrass
 * Dichanthelium longiligulatum — coastal plain witchgrass
 * Dichanthelium meridionale — matting witchgrass
 * Dichanthelium oligosanthes — Heller's witchgrass
 * Dichanthelium ovale — egg-leaf witchgrass
 * Dichanthelium sabulorum — hemlock witchgrass
 * Dichanthelium scabriusculum — woolly witchgrass
 * Dichanthelium sphaerocarpon — roundfruit panicgrass
 * Dichanthelium spretum — Eaton's witchgrass
 * Dichanthelium villosissimum — whitehair witchgrass
 * Dichanthelium wilcoxianum — Wilcox' panicgrass
 * Dichanthelium xanthophysum — slender dichanthelium
 * Digitaria cognata — mountain hairgrass
 * Distichlis spicata — seashore saltgrass
 * Dupontia fisheri — Fisher's dupontia
 * Echinochloa muricata — rough barnyard grass
 * Echinochloa walteri — Walter's barnyard grass
 * Elymus alaskanus — Alaska wild rye
 * Elymus albicans — Montana wild rye
 * Elymus calderi — Calder's wild rye
 * Elymus canadensis — nodding wild rye
 * Elymus diversiglumis — interrupted wild rye
 * Elymus elymoides — bottlebrush squirrel-tail
 * Elymus glaucus — smooth wild rye
 * Elymus hirsutus — boreal wild rye
 * Elymus hystrix — bottlebrush grass
 * Elymus lanceolatus — streamside wild rye
 * Elymus macrourus — thickspike wild rye
 * Elymus riparius — river wild rye
 * Elymus scribneri — Scribner's wild rye
 * Elymus sibiricus — Siberian wild rye
 * Elymus submuticus — wild rye
 * Elymus trachycaulus — slender wild rye
 * Elymus villosus — hairy wild rye
 * Elymus virginicus — Virginia wild rye
 * Elymus vulpinus — Rydberg's wild rye
 * Elymus x dorei — Dore's wild rye
 * Elymus x ebingeri — Ebinger's wild rye
 * Elymus x hansenii — Hansen's wild rye
 * Elymus x maltei — Malte's wild rye
 * Elymus x mossii — Moss' wild rye
 * Elymus x palmerensis — Palmer's wild rye
 * Elymus x pseudorepens — quackgrass
 * Eragrostis capillaris — tiny lovegrass
 * Eragrostis frankii — Frank's lovegrass
 * Eragrostis hypnoides — teal lovegrass
 * Eragrostis pectinacea — purple lovegrass
 * Eragrostis spectabilis — purple lovegrass
 * Festuca altaica — rough fescue
 * Festuca baffinensis — Baffin fescue
 * Festuca brachyphylla — shortleaf fescue
 * Festuca brevissima — Alaska fescue
 * Festuca campestris — blue rough fescue
 * Festuca edlundiae — Arctic festuca
 * Festuca frederikseniae — North Atlantic fescue
 * Festuca hallii — Hall's rough fescue
 * Festuca heteromalla — spreading fescue
 * Festuca hyperborea — boreal fescue
 * Festuca idahoensis — Idaho fescue
 * Festuca lenensis — tundra fescue
 * Festuca minutiflora — smallflower fescue
 * Festuca occidentalis — western fescue
 * Festuca richardsonii — Richardson's fescue
 * Festuca rubra — red fescue
 * Festuca saximontana — Rocky Mountain fescue
 * Festuca subulata — nodding fescue
 * Festuca subuliflora — crinkle-awn fescue
 * Festuca subverticillata — nodding fescue
 * Festuca viridula — mountain fescue
 * Festuca viviparoidea — northern fescue
 * Glyceria borealis — small floating mannagrass
 * Glyceria canadensis — Canada mannagrass
 * Glyceria elata — tall mannagrass
 * Glyceria grandis — American mannagrass
 * Glyceria laxa — northern mannagrass
 * Glyceria leptostachya — slimhead mannagrass
 * Glyceria melicaria — slender mannagrass
 * Glyceria obtusa — blunt mannagrass
 * Glyceria occidentalis — northwestern mannagrass
 * Glyceria pulchella — MacKenzie Valley mannagrass
 * Glyceria septentrionalis — floating mannagrass
 * Glyceria striata — fowl mannagrass
 * Glyceria x gatineauensis — Gatineau mannagrass
 * Helictotrichon hookeri — spike-oat
 * Hesperostipa comata — needle-and-thread
 * Hesperostipa curtiseta — western porcupine grass
 * Hesperostipa spartea — porcupine needlegrass
 * Hierochloe alpina — alpine sweet grass
 * Hierochloe hirta — northern sweet grass
 * Hierochloe odorata — vanilla grass
 * Hierochloe pauciflora — Arctic sweet grass
 * Hordeum brachyantherum — meadow barley
 * Hordeum jubatum — foxtail barley
 * Hordeum pusillum — little barley
 * Koeleria asiatica — Oriental junegrass
 * Koeleria macrantha — prairie junegrass
 * Leersia oryzoides — rice cutgrass
 * Leersia virginica — Virginia cutgrass
 * Leymus cinereus — Great Basin lyme grass
 * Leymus innovatus — northwestern wildrye
 * Leymus mollis — sea lyme grass
 * Leymus triticoides — beardless lyme grass
 * Leymus x vancouverensis — Vancouver Island lyme grass
 * Melica bulbosa — western melicgrass
 * Melica fugax — small melicgrass
 * Melica harfordii — Harford's melicgrass
 * Melica hitchcockii — Alberta melicgrass
 * Melica smithii — Smith's melicgrass
 * Melica spectabilis — showy melicgrass
 * Melica subulata — Alaska onion grass
 * Milium effusum — tall millet grass
 * Monroa squarrosa — munro grass
 * Muhlenbergia andina — foxtail muhly
 * Muhlenbergia asperifolia — alkali muhly
 * Muhlenbergia cuspidata — plains mühlenbergia
 * Muhlenbergia filiformis — Pullup muhly
 * Muhlenbergia frondosa — wirestem muhly
 * Muhlenbergia glomerata — marsh muhly
 * Muhlenbergia mexicana — Mexican muhly
 * Muhlenbergia racemosa — green muhly
 * Muhlenbergia richardsonis — softleaf muhly
 * Muhlenbergia schreberi — Schreiber's muhly
 * Muhlenbergia sobolifera — cliff muhly
 * Muhlenbergia sylvatica — woodland muhly
 * Muhlenbergia tenuiflora — slender muhly
 * Muhlenbergia uniflora — fall dropseed muhly
 * Nassella viridula — green needlegrass
 * Oryzopsis asperifolia — white-grained mountain-ricegrass
 * Panicum capillare — old witch panicgrass
 * Panicum dichotomiflorum — spreading panicgrass
 * Panicum flexile — wiry witch grass
 * Panicum gattingeri — Gattinger's panicgrass
 * Panicum philadelphicum — Philadelphia panicgrass
 * Panicum rigidulum — redtop panicgrass
 * Panicum virgatum — old switch panicgrass
 * Pascopyrum smithii — western wheatgrass
 * Paspalum setaceum — slender paspalum
 * Phalaris arundinacea — reed canarygrass
 * Phippsia algida — ice grass
 * Phippsia concinna — snow grass
 * Phleum alpinum — mountain timothy
 * Phragmites australis — common reed
 * Piptatherum canadense — Canada mountain ricegrass
 * Piptatherum exiguum — little ricegrass
 * Piptatherum micranthum — little mountain-ricegrass
 * Piptatherum pungens — slender mountain-ricegrass
 * Piptatherum racemosum — blackfruit mountain-ricegrass
 * Piptochaetium avenaceum — blackseed needlegrass
 * Pleuropogon refractus — nodding false semaphore grass
 * Pleuropogon sabinei — sabine-grass
 * Poa abbreviata — northern bluegrass
 * Poa alpina — alpine bluegrass
 * Poa alsodes — grove meadow grass
 * Poa arctica — Arctic bluegrass
 * Poa arida — prairie bluegrass
 * Poa confinis — dune bluegrass
 * Poa cusickii — Cusick's bluegrass
 * Poa eminens — largeflower bluegrass
 * Poa fendleriana — muttongrass
 * Poa flexuosa — flexible bluegrass
 * Poa gaspensis — Gaspé Peninsula bluegrass
 * Poa glauca — white bluegrass
 * Poa hartzii — Hartz' bluegrass
 * Poa howellii — Howell's bluegrass
 * Poa interior — inland bluegrass
 * Poa laxa — Mt. Washington bluegrass
 * Poa laxiflora — loose-flowered bluegrass
 * Poa leibergii — Leiberg's bluegrass
 * Poa leptocoma — bog bluegrass
 * Poa lettermanii — Letterman's bluegrass
 * Poa macrantha — sand-dune bluegrass
 * Poa marcida — weak bluegrass
 * Poa nemoralis — woods bluegrass
 * Poa nervosa — Hooker's bluegrass
 * Poa palustris — fowl bluegrass
 * Poa porsildii — Porsild's bluegrass
 * Poa pratensis — Kentucky bluegrass
 * Poa pseudoabbreviata — polar bluegrass
 * Poa reflexa — nodding bluegrass
 * Poa saltuensis — drooping bluegrass
 * Poa secunda — curly bluegrass
 * Poa stenantha — narrowflower bluegrass
 * Poa suksdorfii — western bluegrass
 * Poa sylvestris — woodland bluegrass
 * Poa tolmatchewii — Tolmatchew's bluegrass
 * Poa wheeleri Wheeler's bluegrass
 * Poa x limosa — Lassen County bluegrass
 * Pseudoroegneria spicata — Bluebunch wheatgrass
 * Puccinellia agrostidea — tundra alkali grass
 * Puccinellia ambigua — Alberton alkali grass
 * Puccinellia americana — American alkali grass
 * Puccinellia andersonii — Anderson's alkali grass
 * Puccinellia angustata — northern alkali grass
 * Puccinellia arctica — Arctic alkali grass
 * Puccinellia bruggemannii — Prince Patrick alkali grass
 * Puccinellia deschampsioides — polar alkali grass
 * Puccinellia distans — spreading alkali grass
 * Puccinellia fasciculata — saltmarsh goosegrass
 * Puccinellia grandis — Pacific alkali grass
 * Puccinellia interior — inland alkali grass
 * Puccinellia kurilensis — dwarf alkali grass
 * Puccinellia laurentiana — Tracadigash Mountain alkali grass
 * Puccinellia lemmonii — Lemmon's alkali grass
 * Puccinellia lucida — shining alkali grass
 * Puccinellia macra — Bonaventure Island alkali grass
 * Puccinellia nutkaensis — Alaska alkali grass
 * Puccinellia nuttalliana — Nuttall's alkali grass
 * Puccinellia phryganodes — creeping alkali grass
 * Puccinellia poacea — floodplain alkali grass
 * Puccinellia tenella — tundra alkali grass
 * Puccinellia vaginata — Arctic tussock alkali grass
 * Puccinellia vahliana — Vahl's alkali grass
 * Schedonnardus paniculatus — tumble grass
 * Schizachne purpurascens — purple oat
 * Schizachyrium scoparium — little bluestem
 * Scolochloa festucacea — sprangletop
 * Sorghastrum nutans — yellow Indiangrass
 * Spartina alterniflora — saltwater cordgrass
 * Spartina gracilis — alkali cordgrass
 * Spartina patens — saltmeadow cordgrass
 * Spartina pectinata — freshwater cordgrass
 * Spartina x caespitosa — marsh cordgrass
 * Sphenopholis intermedia — slender wedgescale
 * Sphenopholis nitida — shiny wedgegrass
 * Sphenopholis obtusata — prairie wedgegrass
 * Sporobolus airoides — alkali sacaton
 * Sporobolus compositus — tall dropseed
 * Sporobolus cryptandrus — sand dropseed
 * Sporobolus heterolepis — northern dropseed
 * Sporobolus neglectus — small dropseed
 * Sporobolus vaginiflorus — sheathed dropseed
 * Torreyochloa pallida — pale manna grass
 * Triplasis purpurea — purple sandgrass
 * Trisetum canescens — nodding trisetum
 * Trisetum melicoides — purple false oats
 * Trisetum montanum — mountain oats
 * Trisetum sibiricum — Siberian false oats
 * Trisetum spicatum — narrow false oats
 * Trisetum wolfii — beardless oats
 * Vahlodea atropurpurea — mountain hairgrass
 * Vulpia microstachys — small six-weeks grass
 * Vulpia octoflora — slender eight-flowered fescue
 * Zizania aquatica — eastern wild rice
 * Zizania palustris — northern wild rice
 * x Agroelymus bowdenii
 * x Dupoa labradorica
 * x Elyhordeum chatangensis
 * x Elyhordeum macounii
 * x Elyhordeum montanense
 * x Elyhordeum schaackianum
 * x Elyleymus colvillensis
 * x Elyleymus hirtiflorus
 * x Elyleymus jamesensis
 * x Elyleymus turneri
 * x Elyleymus uclueletensis
 * x Elyleymus ungavensis
 * x Pucciphippsia vacillans

Podostemaceae

 * Podostemum ceratophyllum — threadfoot

Polemoniaceae

 * Collomia grandiflora — largeflower collomia
 * Collomia heterophylla — varied-leaved collomia
 * Collomia linearis — narrow-leaved collomia
 * Collomia tenella — diffuse collomia
 * Gilia sinuata — rosy gilia
 * Gilia tenerrima — delicate gilia
 * Ipomopsis aggregata — scarlet skyrocket
 * Ipomopsis minutiflora — smallflower standing-cypress
 * Leptodactylon pungens — granite prickly-phlox
 * Linanthus bicolor — bicoloured desert-gold
 * Linanthus harknessii — harkness linanthus
 * Linanthus septentrionalis — northern desert-gold
 * Navarretia divaricata — mountain navarretia
 * Navarretia intertexta — needleleaf navarretia
 * Navarretia leucocephala — whiteflower navarretia
 * Navarretia squarrosa — skunkweed
 * Phlox alyssifolia — alyssum-leaf phlox
 * Phlox caespitosa — carpet phlox
 * Phlox diffusa — spreading phlox
 * Phlox divaricata — wild blue phlox
 * Phlox gracilis — slender phlox
 * Phlox hoodii — Hood's phlox
 * Phlox longifolia — longleaf phlox
 * Phlox maculata — northern meadow phlox
 * Phlox richardsonii — Richardson's phlox
 * Phlox sibirica — Siberian phlox
 * Phlox speciosa — showy phlox
 * Polemonium acutiflorum — tall Jacob's-ladder
 * Polemonium boreale — northern Jacob's-ladder
 * Polemonium californicum — California polemonium
 * Polemonium elegans — elegant polemonium
 * Polemonium micranthum — annual polemonium
 * Polemonium occidentale — western Jacob's-ladder
 * Polemonium pulcherrimum — showy Jacob's-ladder
 * Polemonium vanbruntiae — bog Jacob's-ladder
 * Polemonium viscosum — skunk polemonium

Polygalaceae

 * Polygala alba — white milkwort
 * Polygala incarnata — pink milkwort
 * Polygala paucifolia — gaywing milkwort
 * Polygala polygama — racemed milkwort
 * Polygala sanguinea — field milkwort
 * Polygala senega — Seneca snakeroot
 * Polygala verticillata — whorled milkwort

Polygonaceae

 * Eriogonum androsaceum — rock-jasmine wild buckwheat
 * Eriogonum cernuum — nodding wild buckwheat
 * Eriogonum flavum — yellow wild buckwheat
 * Eriogonum heracleoides — parsnip-flower wild buckwheat
 * Eriogonum niveum — snow wild buckwheat
 * Eriogonum ovalifolium — oval-leaf buckwheat
 * Eriogonum pauciflorum — smallflower wild buckwheat
 * Eriogonum pyrolifolium — pyrola-leaved wild buckwheat
 * Eriogonum strictum — blue mountain wild buckwheat
 * Eriogonum umbellatum — sulphur-flower wild buckwheat
 * Koenigia islandica — island kœnigia
 * Oxyria digyna — mountain-sorrel
 * Polygonella articulata — eastern jointweed
 * Polygonum achoreum — leathery knotweed
 * Polygonum alpinum — alpine smartweed
 * Polygonum amphibium — water smartweed
 * Polygonum arifolium — halberd-leaf tearthumb
 * Polygonum bellardii — narrowleaf knotweed
 * Polygonum bistorta — meadow bistort
 * Polygonum bistortoides — American bistort
 * Polygonum boreale — northern knotweed
 * Polygonum buxiforme — Small's knotweed
 * Polygonum careyi — Carey's smartweed
 * Polygonum caurianum — Alaska knotweed
 * Polygonum ciliinode — fringed black-bindweed
 * Polygonum douglasii — Douglas' knotweed
 * Polygonum erectum — erect knotweed
 * Polygonum fowleri — Fowler's knotweed
 * Polygonum franktonii — Nova Scotia knotweed
 * Polygonum hudsonianum — Hudson Bay knotweed
 * Polygonum hydropiper — marshpepper smartweed
 * Polygonum hydropiperoides — mild water-pepper
 * Polygonum lapathifolium — dockleaf smartweed
 * Polygonum minimum — leafy dwarf knotweed
 * Polygonum oxyspermum — sharpfruit knotweed
 * Polygonum paronychia — beach knotweed
 * Polygonum pensylvanicum — Pennsylvania smartweed
 * Polygonum polygaloides — white-margin knotweed
 * Polygonum punctatum — dotted smartweed
 * Polygonum raii — Ray's knotweed
 * Polygonum ramosissimum — bushy knotweed
 * Polygonum robustius — stout smartweed
 * Polygonum sagittatum — arrowleaf tearthumb
 * Polygonum scandens — climbing false buckwheat
 * Polygonum tenue — slender knotweed
 * Polygonum virginianum — Virginia knotweed
 * Polygonum viviparum — viviparous knotweed
 * Rumex acetosa — garden sorrel
 * Rumex altissimus — tall dock
 * Rumex aquaticus — western dock
 * Rumex arcticus — Arctic dock
 * Rumex beringensis — Bering Sea dock
 * Rumex maritimus — seaside dock
 * Rumex occidentalis
 * Rumex orbiculatus — water dock
 * Rumex pallidus — seabeach dock
 * Rumex paucifolius — alpine sheep sorrel
 * Rumex salicifolius — willow dock
 * Rumex venosus — veined dock
 * Rumex verticillatus — swamp dock
 * Rumex x alexidis
 * Rumex x franktonis — Frankton's dock

Polypodiaceae

 * Polypodium amorphum — irregular polypody
 * Polypodium appalachianum — Appalachian rockcap fern
 * Polypodium glycyrrhiza — licorice fern
 * Polypodium hesperium — western polypody
 * Polypodium scouleri — coast polypody
 * Polypodium sibiricum — Siberian polypody
 * Polypodium virginianum — rock polypody
 * Polypodium x incognitum

Polytrichaceae

 * Atrichum altecristatum
 * Atrichum angustatum
 * Atrichum crispum
 * Atrichum haussknechtii
 * Atrichum oerstedianum
 * Atrichum selwynii
 * Atrichum tenellum
 * Atrichum undulatum — wavy catherinea
 * Bartramiopsis lescurii
 * Oligotrichum aligerum
 * Oligotrichum falcatum
 * Oligotrichum hercynicum
 * Oligotrichum parallelum
 * Pogonatum brachyphyllum — haircap
 * Pogonatum contortum
 * Pogonatum dentatum — haircap
 * Pogonatum pensilvanicum
 * Pogonatum urnigerum — haircap
 * Polytrichastrum alpinum — alpine polytrichastrum moss
 * Polytrichum commune — common haircap moss
 * Polytrichum formosum
 * Polytrichum hyperboreum
 * Polytrichum juniperinum — juniper moss
 * Polytrichum longisetum — haircap
 * Polytrichum lyallii
 * Polytrichum ohioense
 * Polytrichum pallidisetum
 * Polytrichum piliferum — hairmoss
 * Polytrichum sexangulare
 * Polytrichum sphaerothecium
 * Polytrichum strictum — bog haircap moss
 * Polytrichum swartzii
 * Psilopilum cavifolium
 * Psilopilum laevigatum

Pontederiaceae

 * Heteranthera dubia — grassleaf mud-plantain
 * Pontederia cordata — pickerelweed

Porellaceae

 * Porella cordaeana
 * Porella navicularis
 * Porella pinnata
 * Porella platyphylla
 * Porella platyphylloidea
 * Porella roellii

Portulacaceae

 * Calandrinia ciliata — red maids
 * Cistanthe tweedyi — Tweedy's bitterroot
 * Cistanthe umbellata — Mount Hood pussy-paws
 * Claytonia caroliniana — Carolina spring-beauty
 * Claytonia cordifolia — heartleaf spring-beauty
 * Claytonia exigua — serpentine spring-beauty
 * Claytonia lanceolata — lanceleaf spring-beauty
 * Claytonia megarhiza — alpine spring-beauty
 * Claytonia ogilviensis — Ogilve Mountain spring-beauty
 * Claytonia parviflora — littleflower spring-beauty
 * Claytonia perfoliata — miner's-lettuce
 * Claytonia rubra — redstem spring-beauty
 * Claytonia sarmentosa — Alaska spring-beauty
 * Claytonia scammaniana — Scamman's spring-beauty
 * Claytonia sibirica — Siberian spring-beauty
 * Claytonia tuberosa — tuber spring-beauty
 * Claytonia virginica — narrowleaf spring-beauty
 * Claytonia washingtoniana — Washington spring-beauty
 * Lewisia columbiana — Columbian bitterroot
 * Lewisia pygmaea — alpine bitterroot
 * Lewisia rediviva — Oregon bitterroot
 * Lewisia triphylla — three-leaf bitterroot
 * Montia bostockii — Bostock's miner's-lettuce
 * Montia chamissoi — Chamisso's miner's-lettuce
 * Montia dichotoma — dwarf miner's-lettuce
 * Montia diffusa — diffuse montia
 * Montia fontana — fountain miner's-lettuce
 * Montia howellii — Howell's miner's-lettuce
 * Montia linearis — linearleaf miner's-lettuce
 * Montia parvifolia — littleleaf miner's-lettuce
 * Talinum sediforme — Okanogan flameflower

Potamogetonaceae

 * Potamogeton alpinus — northern pondweed
 * Potamogeton amplifolius — largeleaf pondweed
 * Potamogeton bicupulatus — snail-seed pondweed
 * Potamogeton compressus — flatstem pondweed
 * Potamogeton confervoides — algæ-like pondweed
 * Potamogeton epihydrus — Nuttall's pondweed
 * Potamogeton filiformis — slender pondweed
 * Potamogeton foliosus — leafy pondweed
 * Potamogeton friesii — Fries' pondweed
 * Potamogeton gramineus — grassy pondweed
 * Potamogeton hillii — Hill's pondweed
 * Potamogeton illinoensis — Illinois pondweed
 * Potamogeton methyensis — Methy Lake pondweed
 * Potamogeton natans — floating pondweed
 * Potamogeton nodosus — longleaf pondweed
 * Potamogeton oakesianus — Oakes' pondweed
 * Potamogeton oblongus — cinnamon-spot pondweed
 * Potamogeton obtusifolius — bluntleaf pondweed
 * Potamogeton ogdenii — Ogden's pondweed
 * Potamogeton pectinatus — Sago pondweed
 * Potamogeton perfoliatus — claspingleaf pondweed
 * Potamogeton praelongus — whitestem pondweed
 * Potamogeton pulcher — spotted pondweed
 * Potamogeton pusillus — slender pondweed
 * Potamogeton richardsonii — redheadgrass
 * Potamogeton robbinsii — flatleaf pondweed
 * Potamogeton spirillus — spiral pondweed
 * Potamogeton strictifolius — straightleaf pondweed
 * Potamogeton subsibiricus — Yenisei River pondweed
 * Potamogeton vaginatus — sheathed pondweed
 * Potamogeton vaseyi — Vasey's pondweed
 * Potamogeton x faxonii — Faxon's pondweed
 * Potamogeton x griffithii — Griffith's pondweed
 * Potamogeton x hagstroemii — Hagstrøm's pondweed
 * Potamogeton x haynesii — Haynes' pondweed
 * Potamogeton x nericus
 * Potamogeton x nitens
 * Potamogeton x saxonicus — Saxon pondweed
 * Potamogeton x schreberi — Schreiber's pondweed
 * Potamogeton x scoliophyllus
 * Potamogeton x sparganiifolius
 * Potamogeton x spathuliformis
 * Potamogeton x suecicus

Pottiaceae

 * Acaulon muticum
 * Acaulon triquetrum
 * Aloina bifrons
 * Aloina brevirostris
 * Aloina rigida
 * Anoectangium aestivum
 * Anoectangium tenuinerve
 * Astomum muehlenbergianum
 * Astomum phascoides
 * Barbula amplexifolia
 * Barbula convoluta
 * Barbula coreensis
 * Barbula eustegia
 * Barbula indica
 * Barbula unguiculata
 * Bryoerythrophyllum columbianum
 * Bryoerythrophyllum ferruginascens
 * Bryoerythrophyllum recurvirostre
 * Crossidium aberrans
 * Crossidium seriatum
 * Crumia latifolia
 * Desmatodon cernuus
 * Desmatodon convolutus
 * Desmatodon guepinii
 * Desmatodon heimii
 * Desmatodon latifolius
 * Desmatodon laureri
 * Desmatodon leucostoma
 * Desmatodon obtusifolius
 * Desmatodon porteri
 * Desmatodon randii
 * Desmatodon systylius
 * Didymodon asperifolius
 * Didymodon fallax
 * Didymodon johansenii
 * Didymodon leskeoides
 * Didymodon michiganensis
 * Didymodon nevadensis
 * Didymodon nigrescens
 * Didymodon rigidulus
 * Didymodon subandreaeoides
 * Didymodon tophaceus
 * Didymodon vinealis
 * Eucladium verticillatum — lime-seep eucladium
 * Geheebia gigantea
 * Gymnostomum aeruginosum
 * Gymnostomum calcareum
 * Gyroweisia reflexa
 * Gyroweisia tenuis
 * Hymenostylium insigne
 * Hymenostylium recurvirostre — hymenostylium moss
 * Hyophila involuta — hyophila moss
 * Molendoa sendtneriana
 * Oxystegus spiralis
 * Oxystegus tenuirostris
 * Paraleptodontium recurvifolium
 * Phascum cuspidatum
 * Phascum floerkeanum
 * Phascum vlassovii
 * Pleurochaete squarrosa
 * Pottia bryoides
 * Pottia davalliana
 * Pottia intermedia
 * Pottia nevadensis
 * Pottia truncata
 * Pottia wilsonii
 * Pseudocrossidium revolutum
 * Pterygoneurum kozlovii
 * Pterygoneurum lamellatum
 * Pterygoneurum ovatum
 * Pterygoneurum subsessile
 * Stegonia latifolia
 * Stegonia pilifera
 * Timmiella crassinervis
 * Tortella arctica
 * Tortella fragilis
 * Tortella humilis
 * Tortella inclinata
 * Tortella tortelloides
 * Tortella tortuosa — twisted moss
 * Tortula amplexa
 * Tortula bartramii
 * Tortula bolanderi
 * Tortula brevipes
 * Tortula cainii
 * Tortula caninervis — tortula moss
 * Tortula laevipila
 * Tortula latifolia
 * Tortula mucronifolia
 * Tortula muralis
 * Tortula norvegica
 * Tortula papillosa
 * Tortula papillosissima
 * Tortula princeps
 * Tortula ruralis — tortula moss
 * Tortula scotteri
 * Tortula subulata
 * Trichostomopsis australasiae
 * Trichostomum arcticum
 * Trichostomum crispulum
 * Weissia controversa
 * Weissia hedwigii

Primulaceae

 * Anagallis minima — chaffweed
 * Androsace alaskana (syn. Douglasia alaskana) — Alaska rock-jasmine
 * Androsace chamaejasme — sweetflower rock-jasmine
 * Androsace filiformis — slender rock-jasmine
 * Androsace laevigata (syn. Douglasia laevigata) — cliff douglasia
 * Androsace montana (syn. Douglasia montana) — mountain douglasia
 * Androsace occidentalis — western rock-jasmine
 * Androsace ochotensis (syns. Androsace arctica, Douglasia ochotensis) — Alaska douglasia
 * Androsace septentrionalis (syn. Douglasia ochotensis subsp. gormanii ) — pygmyflower rock-jasmine, Gorman's douglasia
 * Dodecatheon conjugens — Bonneville shootingstar
 * Dodecatheon dentatum — white shootingstar
 * Dodecatheon frigidum — northern shootingstar
 * Dodecatheon hendersonii — Henderson's shootingstar
 * Dodecatheon jeffreyi — Jeffrey's shootingstar
 * Dodecatheon meadia — shootingstar
 * Dodecatheon pulchellum — few-flower shootingstar
 * Glaux maritima — sea milkwort
 * Lysimachia ciliata — fringed loosestrife
 * Lysimachia hybrida — lanceleaf loosestrife
 * Lysimachia lanceolata — lanceleaf loosestrife
 * Lysimachia quadriflora — four-flower loosestrife
 * Lysimachia quadrifolia — whorled yellow loosestrife
 * Lysimachia terrestris — swamp loosestrife
 * Lysimachia thyrsiflora — water loosestrife
 * Lysimachia × commixta
 * Lysimachia × producta
 * Primula borealis — slender primrose
 * Primula cuneifolia — wedgeleaf primrose
 * Primula egaliksensis — Greenland primrose
 * Primula eximia — Arctic primrose
 * Primula incana — Jones' primrose
 * Primula laurentiana — St. Lawrence primrose
 * Primula mistassinica — bird's-eye primrose
 * Primula nutans — sleepy primrose
 * Primula stricta — stiff primrose
 * Samolus valerandi — Valerand's brookweed
 * Trientalis borealis — northern starflower
 * Trientalis europaea — Arctic starflower

Pseudolepicoleaceae

 * Blepharostoma trichophyllum

Pteridaceae

 * Adiantum aleuticum — Aleutian maidenhair fern
 * Adiantum capillus-veneris — southern maidenhair fern
 * Adiantum pedatum — northern maidenhair fern
 * Adiantum viridimontanum — Green Mountain maidenhair fern
 * Aspidotis densa — Indian's-dream
 * Cheilanthes feei — Fee's lipfern
 * Cheilanthes gracillima — lace lipfern
 * Cryptogramma acrostichoides — American rockbrake
 * Cryptogramma cascadensis — Cascade rockbrake
 * Cryptogramma sitchensis — Sitka rockbrake
 * Cryptogramma stelleri — fragile rockbrake
 * Pellaea atropurpurea — purplestem rockbrake
 * Pellaea gastonyi — Gastony's rockbrake
 * Pellaea glabella — smooth rockbrake
 * Pentagramma triangularis — western gold fern

Pterigynandraceae

 * Heterocladium dimorphum
 * Heterocladium macounii
 * Heterocladium procurrens
 * Iwatsukiella leucotricha
 * Myurella julacea
 * Myurella sibirica
 * Myurella tenerrima
 * Pterigynandrum filiforme

Ptilidiaceae

 * Ptilidium ciliare — northern naugehyde liverwort
 * Ptilidium pulcherrimum

Ptychomitriaceae

 * Campylostelium saxicola — rock-loving swan-necked moss
 * Ptychomitrium gardneri
 * Ptychomitrium incurvum

Pyrolaceae

 * Chimaphila maculata — spotted wintergreen
 * Chimaphila menziesii — Menzies' wintergreen
 * Chimaphila umbellata — common wintergreen
 * Moneses uniflora — one-flower wintergreen
 * Orthilia secunda — one-side wintergreen
 * Pyrola americana — American wintergreen
 * Pyrola asarifolia — pink wintergreen
 * Pyrola chlorantha — greenflower wintergreen
 * Pyrola elliptica — shinleaf
 * Pyrola grandiflora — Arctic wintergreen
 * Pyrola minor — lesser wintergreen
 * Pyrola picta — whitevein wintergreen