List of Canadian plants by family PQ

"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 gerardii" — 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 wiegandii" — Wiegand'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 cilinode" — 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 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"
* "Potamogeton zosteriformis" — flatstem pondweed

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 chamaejasme" — sweetflower rock-jasmine
* "Androsace filiformis" — slender rock-jasmine
* "Androsace occidentalis" — western rock-jasmine
* "Androsace septentrionalis" — pygmyflower rock-jasmine
* "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
* "Douglasia alaskana" — Alaska rock-jasmine
* "Douglasia arctica" — MacKenzie's river douglasia
* "Douglasia gormanii" — Gorman's douglasia
* "Douglasia laevigata" — cliff douglasia
* "Douglasia montana" — mountain douglasia
* "Douglasia ochotensis" — Alaska douglasia
* "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 x commixta"
* "Lysimachia x 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