List of Canadian plants by family P–Q

Main page: List of Canadian plants by family

This is a dynamic list and may never be able to satisfy particular standards for completeness. You can help by expanding it with reliably sourced entries.

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 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 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 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