# List of Canadian plants by family P–Q

Main page: List of Canadian plants by family
Families: 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 Z

## 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