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4756 Plants Found

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Ordered by scientific name.

Scientific Name	Common Name	†	Map‡
Operculina pinnatifida (Kunth) O'Donell	tansyleaf lidpod
Ophioglossum crotalophoroides Walter	bulbous adderstongue
Ophioglossum engelmannii Prantl	limestone adderstongue
Ophioglossum nudicaule L. f.	least adderstongue
Ophioglossum petiolatum Hook.	longstem adderstongue
Ophioglossum pusillum Raf.	northern adderstongue
Ophioglossum vulgatum L.	southern adderstongue
Oplismenus hirtellus (L.) P. Beauv.	basketgrass
Opuntia aciculata Griffiths	chenille pricklypear
Opuntia edwardsii V.E. Grant & K.A. Grant	Edwards' Pricklypear
Opuntia engelmannii Salm-Dyck ex Engelm.	Cactus Apple
Opuntia fragilis (Nutt.) Haw.	brittle pricklypear
Opuntia humifusa (Raf.) Raf.	Eastern prickly pear
Opuntia macrorhiza Engelm.	twistspine pricklypear
Opuntia phaeacantha Engelm.	tulip pricklypear
Opuntia polyacantha Haw.	plains pricklypear
Opuntia stricta (Haw.) Haw.	erect pricklypear
Opuntia tortispina Engelm. & J.M.Bigelow	Grassland Pricklypear
Orbexilum onobrychis (Nutt.) Rydb.	French-grass
Orbexilum pedunculatum (Mill.) Rydb.	Sampson's snakeroot
Orbexilum simplex (Nutt. ex Torr. & A. Gray) Rydb.	singlestem leather-root
Oreocarya fulvocanescens (S.Watson) Greene	Tawny Cryptantha
Oreocarya oblata (M.E.Jones) J.F.Macbr.	Rough Perennial Cat's-Eye
Oreocarya suffruticosa var. setosa (M.E.Jones) R.B.Kelley	James' Perennial Cat's-Eye
Oreochrysum parryi (A. Gray) Rydb.	Parry's goldenrod
Oreostemma alpigenum (Torr. & A. Gray) Greene	tundra aster
Orobanche fasciculata Nutt.	clustered broomrape
Orobanche ludoviciana Nutt.	Louisiana Broomrape
Orobanche riparia L.T. Collins	River Broomrape
Orobanche uniflora L.	One-flowered Broomrape
Orthilia secunda (L.) House	sidebells wintergreen
Orthocarpus luteus Nutt.	yellow owl's-clover
Oryzopsis asperifolia Michx.	roughleaf ricegrass
Osmorhiza berteroi DC.	sweetcicely
Osmorhiza claytonii (Michx.) C.B. Clarke	Clayton's Sweetroot
Osmorhiza depauperata Phil.	bluntseed sweetroot
Osmorhiza longistylis (Torr.) DC.	Aniseroot
Osmorhiza occidentalis (Nutt. ex Torr. & A. Gray) Torr.	western sweetroot
Osmunda claytoniana L.	interrupted fern
Osmunda spectabilis Willd.	American Royal Fern
Osmundastrum cinnamomeum (L.) C.Presl	Cinnamon Fern
Ostrya knowltonii Sarg.	Knowlton's hophornbeam
Ostrya virginiana (Mill.) K. Koch	American Hophornbeam
Oxalis albicans Kunth	radishroot woodsorrel
Oxalis dichondrifolia A. Gray	peonyleaf woodsorrel
Oxalis dillenii Jacq.	Slender Yellow Woodsorrel
Oxalis drummondii A. Gray	Drummond's woodsorrel
Oxalis frutescens L.	shrubby woodsorrel
Oxalis intermedia A. Rich.	West Indian woodsorrel
Oxalis violacea L.	Violet Woodsorrel
Oxybasis rubra (L.) S.Fuentes, Uotila & Borsch	Red Goosefoot
Oxycaryum cubense (Poepp. & Kunth) Lye	Cuban bulrush
Oxypolis fendleri (A. Gray) A. Heller	Fendler's Cowbane
Oxypolis rigidior (L.) Raf.	stiff cowbane
Oxyria digyna (L.) Hill	Alpine Mountainsorrel
Oxytropis besseyi (Rydb.) Blank.	Bessey's locoweed
Oxytropis borealis DC.	boreal locoweed
Oxytropis campestris (L.) DC.	Field Locoweed
Oxytropis deflexa (Pall.) DC.	nodding locoweed
Oxytropis lagopus Nutt.	haresfoot locoweed
Oxytropis lambertii Pursh	purple locoweed
Oxytropis monticola A. Gray	yellowflower locoweed
Oxytropis multiceps Nutt.	Nuttall's Oxytrope
Oxytropis sericea Nutt.	white locoweed
Oxytropis splendens Douglas ex Hook.	showy locoweed
Packera aurea (L.) Á. Löve & D. Löve	Golden Ragwort
Packera cana (Hook.) W.A. Weber & Á. Löve	woolly groundsel
Packera dimorphophylla (Greene) W.A. Weber & Á. Löve	Splitleaf Groundsel
Packera dubia (Spreng.) Trock & Mabb.	Woolly Ragwort
Packera fendleri (A. Gray) W.A. Weber & Á. Löve	Fendler's Ragwort
Packera glabella (Poir.) C. Jeffrey	Butterweed
Packera multilobata (Torr. & A. Gray ex A. Gray) W.A. Weber & Á. Löve	Lobeleaf Groundsel
Packera obovata (Muhl. ex Willd.) W.A. Weber & Á. Löve	roundleaf ragwort
Packera paupercula (Michx.) Á. Löve & D. Löve	Balsam Groundsel
Packera plattensis (Nutt.) W.A. Weber & Á. Löve	prairie groundsel
Packera pseudaurea (Rydb.) W.A. Weber & Á. Löve	falsegold groundsel
Packera sanguisorboides (Rydb.) W.A. Weber & Á. Löve	Burnet Ragwort
Packera streptanthifolia (Greene) W.A. Weber & Á. Löve	Rocky Mountain Groundsel
Packera subnuda (DC.) D.K. Trock & T.M. Barkley	Buek's groundsel
Packera tampicana (DC.) C. Jeffrey	Great Plains ragwort
Packera thurberi (A.Gray) B.L.Turner	Threetooth Ragwort
Packera werneriifolia (A. Gray) W.A. Weber & Á. Löve	Hoary Groundsel
Palafoxia callosa (Nutt.) Torr. & A. Gray	small palafox
Palafoxia hookeriana Torr. & A. Gray	sand palafox
Palafoxia reverchonii (Bush) Cory	Reverchon's Palafox
Palafoxia rosea (Bush) Cory	rosy palafox
Palafoxia sphacelata (Nutt. ex Torr.) Cory	othake
Palafoxia texana DC.	Texas palafox
Panax quinquefolius L.	American ginseng
Panicum amarum Elliott	Bitter Panicgrass
Panicum brachyanthum Steud.	prairie panicgrass
Panicum bulbosum Kunth	Bulb Panicgrass
Panicum capillare L.	Witchgrass
Panicum capillarioides Vasey	slender panicgrass
Panicum diffusum Sw.	West Indian panicgrass
Panicum flexile (Gattinger) Scribn.	wiry panicgrass
Panicum ghiesbreghtii Fourn.	Ghiesbreght's panicgrass
Panicum hallii Vasey	Hall's panicgrass
Panicum havardii Vasey	Havard's Panicgrass
Panicum hemitomon Schult.	Maidencane
Panicum hirsutum Sw.	hairy panicgrass
Panicum hirticaule J. Presl	Mexican panicgrass
Panicum philadelphicum Bernh. ex Trin.	Philadelphia panicgrass
Panicum rigidulum Bosc ex Nees	Redtop Panicgrass
Panicum trichoides Sw.	tropical panicgrass
Panicum verrucosum Muhl.	warty panicgrass
Panicum virgatum L.	Switchgrass
Pappophorum bicolor Fourn.	pink pappusgrass
Pappophorum vaginatum Buckley	whiplash pappusgrass
Parietaria floridana Nutt.	Florida Pellitory
Parietaria pensylvanica Muhl. ex Willd.	Pennsylvania Pellitory
Parkinsonia texana (A. Gray) S. Watson	Texas paloverde
Parnassia fimbriata K.D. Koenig	Fringed Grass of Parnassus
Parnassia glauca Raf.	fen grass of Parnassus
Parnassia palustris L.	marsh grass of Parnassus
Paronychia canadensis (L.) Alph. Wood	smooth forked nailwort
Paronychia depressa (Torr. & A. Gray) Nutt. ex A. Nelson	Spreading Nailwort
Paronychia drummondii Torr. & A. Gray	Drummond's nailwort
Paronychia fastigiata (Raf.) Fernald	hairy forked nailwort
Paronychia jamesii Torr. & A. Gray	James' nailwort
Paronychia jonesii M.C. Johnst.	Jones' nailwort
Paronychia lindheimeri Engelm. ex A. Gray	Forked Nailwort
Paronychia sessiliflora Nutt.	creeping nailwort
Paronychia setacea Torr. & A. Gray	bristle nailwort
Paronychia virginica Spreng.	Yellow Nailwort
Parthenium alpinum (Nutt.) Torr. & A. Gray	Alpine Feverfew
Parthenium confertum A. Gray	Gray's feverfew
Parthenium incanum Kunth	Mariola
Parthenium integrifolium L.	Wild Quinine
Parthenocissus heptaphylla (Buckley) Britton ex Small	sevenleaf creeper
Parthenocissus vitacea (Knerr) Hitchc.	Woodbine
Pascopyrum smithii (Rydb.) Á. Löve	Western Wheatgrass
Paspalum bifidum (Bertol.) Nash	pitchfork crowngrass
Paspalum boscianum Flueggé	bull crowngrass
Paspalum conjugatum P.J. Bergius	hilograss
Paspalum denticulatum Trin.	longtom
Paspalum dissectum (L.) L.	mudbank crowngrass
Paspalum floridanum Michx.	Florida paspalum
Paspalum hartwegianum Fourn.	Hartweg's paspalum
Paspalum laeve Michx.	Field Paspalum
Paspalum minus Fourn.	matted paspalum
Paspalum monostachyum Vasey	gulfdune paspalum
Paspalum plicatulum Michx.	brownseed paspalum
Paspalum praecox Walter	early paspalum
Paspalum repens P.J.Bergius	Horsetail Paspalum
Paspalum setaceum Michx.	thin paspalum
Paspalum unispicatum (Scribn. & Merr.) Nash	onespike paspalum
Paspalum vaginatum Sw.	seashore paspalum
Paspalum virgatum L.	talquezal
Paspalum wrightii Hitchc. & Chase	Wright's paspalum
Passiflora affinis Engelm.	bracted passionflower
Passiflora ciliata Aiton	fringed passionflower
Passiflora filipes Benth.	slender passionflower
Passiflora foetida L.	fetid passionflower
Passiflora incarnata L.	purple passionflower
Passiflora lutea L.	yellow passionflower
Passiflora tenuiloba Engelm.	birdwing passionflower
Patis racemosa "(Sm.) Romasch.	blackseed ricegrass
Pattalias palustris (Pursh) Fishbein	Gulf Coast Swallow-wort
Pavonia lasiopetala Scheele	Texas swampmallow
Paxistima myrsinites (Pursh) Raf.	Oregon boxleaf
Pectis angustifolia Torr.	lemonscent
Pedicularis bracteosa Benth.	bracted lousewort
Pedicularis canadensis L.	Canadian lousewort
Pedicularis contorta Benth.	coiled lousewort
Pedicularis cystopteridifolia Rydb.	Fernleaved Pedicularis
Pedicularis groenlandica Retz.	Elephanthead Lousewort
Pedicularis lanceolata Michx.	Swamp Lousewort
Pedicularis parryi A. Gray	Parry's Lousewort
Pedicularis procera A. Gray	giant lousewort
Pedicularis racemosa Douglas ex Benth.	Sickletop Lousewort
Pediocactus simpsonii (Engelm.) Britton & Rose	Mountain Ball Cactus
Pediomelum argophyllum (Pursh) J. Grimes	silverleaf Indian breadroot
Pediomelum cuspidatum (Pursh) Rydb.	largebract Indian breadroot
Pediomelum cyphocalyx (A. Gray) Rydb.	Turniproot
Pediomelum digitatum (Nutt. ex Torr. & A. Gray) Isely	palmleaf Indian breadroot
Pediomelum esculentum (Pursh) Rydb.	large Indian breadroot
Pediomelum hypogaeum (Nutt. ex Torr. & A. Gray) Rydb.	subterranean Indian breadroot
Pediomelum latestipulatum (Shinners) Mahler	Texas Plains Indian breadroot
Pediomelum linearifolium (Torr. & A. Gray) J. Grimes	Narrowleaf Indian Breadroot
Pediomelum reverchonii (S. Watson) Rydb.	Rock Indian Breadroot
Pediomelum rhombifolium (Torr. & A. Gray) Rydb.	Gulf Indian breadroot
Pediomelum tenuiflorum (Pursh) A.N.Egan	Slimflower Scurfpea
Pellaea atropurpurea (L.) Link	Purple Cliffbrake
Pellaea breweri D.C. Eaton	Brewer's cliffbrake
Pellaea glabella Mett. ex Kuhn	smooth cliffbrake
Pellaea wrightiana Hook.	Wright's cliffbrake
Peltandra virginica (L.) Schott	green arrow arum
Pennellia longifolia (Benth.) Rollins	longleaf mock thelypody
Pennellia micrantha (A. Gray) Nieuwl.	mountain mock thelypody
Penstemon albertinus Greene	Alberta beardtongue
Penstemon albidus Nutt.	white penstemon
Penstemon ambiguus Torr.	gilia beardtongue
Penstemon angustifolius Nutt. ex Pursh	Broadbeard Beardtongue
Penstemon arkansanus Pennell	Arkansas Beardtongue
Penstemon attenuatus Douglas ex Lindl.	Sulphur Penstemon
Penstemon auriberbis Pennell	Colorado Beardtongue
Penstemon baccharifolius Hook.	baccharisleaf beardtongue
Penstemon barbatus (Cav.) Roth	beardlip penstemon
Penstemon bradburyi Pursh	Large-flowered Beardtongue
Penstemon buckleyi Pennell	Buckley's Beardtongue
Penstemon calycosus Small	Longsepal Beardtongue
Penstemon confertus Douglas ex Lindl.	Yellow Penstemon
Penstemon eriantherus Pursh	Fuzzytongue Penstemon
Penstemon fendleri Torr. & A. Gray	Fendler's Penstemon
Penstemon glaber Pursh	Sawsepal Penstemon
Penstemon gracilis Nutt.	Lilac Penstemon
Penstemon guadalupensis A. Heller	Guadalupe Beardtongue
Penstemon haydenii S. Watson	Blowout Beardtongue
Penstemon inflatus Crosswh.	Inflated Beardtongue
Penstemon jamesii Benth.	James' beardtongue
Penstemon laricifolius Hook. & Arn.	Larchleaf Beardtongue
Penstemon laxiflorus Pennell	Nodding Beardtongue
Penstemon lyallii (A. Gray) A. Gray	Lyall's beardtongue
Penstemon montanus Greene	Cordroot Beardtongue
Penstemon murrayanus Hook.	Scarlet Beardtongue
Penstemon nitidus Douglas ex Benth.	waxleaf penstemon
Penstemon oklahomensis Pennell	Oklahoma Beardtongue
Penstemon oliganthus Wooton & Standl.	Apache Beardtongue
Penstemon pallidus Small	Pale Beardtongue
Penstemon palmeri A. Gray	Palmer's Penstemon
Penstemon procerus Douglas ex Graham	littleflower penstemon
Penstemon rydbergii A. Nelson	Rydberg's Penstemon
Penstemon secundiflorus Benth.	Sidebells Penstemon
Penstemon secundiflorus var. versicolor (Pennell) C.C.Freeman	Variable-Color Beardtongue
Penstemon strictus Benth.	Rocky Mountain Penstemon
Penstemon tenuis Small	Sharpsepal Beardtongue
Penstemon triflorus A. Heller	Heller's Beardtongue
Penstemon tubaeflorus Nutt.	White Wand Beardtongue
Penstemon unilateralis Rydb.	Oneside Penstemon
Penstemon virens Pennell ex Rydb.	Front Range Beardtongue
Penstemon virgatus A. Gray	upright blue beardtongue
Penstemon whippleanus A. Gray	Whipple's Penstemon
Penthorum sedoides L.	ditch stonecrop
Pentodon pentandrus (Schumach. & Thonn.) Vatke	Hale's pentodon
Pereskia aculeata Mill.	Barbados shrub
Pericome caudata A. Gray	mountain tail-leaf
Perideridia americana (Nutt. ex DC.) Rchb.	Eastern Yampah
Perideridia gairdneri (Hook. & Arn.) Mathias	Gardner's yampah
Perityle lindheimeri (A. Gray) Shinners	Lindheimer's Rockdaisy
Persea borbonia (L.) Spreng.	redbay
Persicaria amphibia (L.) Delarbre	Water Knotweed
Persicaria glabra (Willd.) M.Gómez	Smooth Knotweed
Persicaria hydropiperoides (Michx.) Small	Swamp Smartweed
Persicaria lapathifolia (L.) Delarbre	Pale Smartweed
Persicaria meisneriana (Cham. & Schltdl.) M.Gómez	Branched Tearthumb
Persicaria robustior (Small) E.P.Bicknell	Stout Smartweed
Persicaria sagittata (L.) H.Gross	Arrowleaf Tearthumb
Persicaria setacea (Baldwin) Small	Bog Smartweed
Persicaria virginiana L.	Jumpseed
Petasites frigidus (L.) Fr.	arctic sweet coltsfoot
Petiveria alliacea L.	guinea henweed
Petrophytum caespitosum (Nutt.) Rydb.	mat rockspirea
Phacelia alba Rydb.	white phacelia
Phacelia congesta Hook.	caterpillars
Phacelia denticulata Osterh.	Rocky Mountain Phacelia
Phacelia gilioides Brand	Brand's Phacelia
Phacelia glabra Nutt.	smooth phacelia
Phacelia hastata Douglas ex Lehm.	Silverleaf Phacelia
Phacelia heterophylla Pursh	varileaf phacelia
Phacelia hirsuta Nutt.	fuzzy phacelia
Phacelia integrifolia Torr.	gypsum phacelia
Phacelia laxa Small	coastal phacelia
Phacelia linearis (Pursh) Holz.	threadleaf phacelia
Phacelia neomexicana Thurb. ex Torr.	New Mexico phacelia
Phacelia patuliflora (Engelm. & A. Gray) A. Gray	sand phacelia
Phacelia popei Torr. & A. Gray	Pope's phacelia
Phacelia purshii Buckley	Miami Mist
Phacelia robusta (J.F. Macbr.) I.M. Johnst.	stout phacelia
Phacelia sericea (Graham) A. Gray	silky phacelia
Phacelia strictiflora (Engelm. & A. Gray) A. Gray	prairie phacelia
Phacelia thermalis Greene	Heated Phacelia
Phalaris angusta Nees ex Trin.	timothy canarygrass
Phalaris arundinacea L.	Reed Canary Grass
Phaseolus filiformis Benth.	slimjim bean
Phaulothamnus spinescens A. Gray	devilqueen
Phegopteris connectilis (Michx.) Watt	long beechfern
Phegopteris hexagonoptera (Michx.) Fée	broad beechfern
Phemeranthus aurantiacus (Engelm.) Kiger	orange fameflower
Phemeranthus brevicaulis (S. Watson) Kiger	dwarf fameflower
Phemeranthus calycinus (Engelm.) Kiger	Largeflower Fameflower
Phemeranthus confertiflorus (Greene) Hershkovitz	New Mexico fameflower
Phemeranthus longipes (Wooton & Standl.) Kiger	pink fameflower
Phemeranthus parviflorus (Nutt.) Kiger	sunbright
Phemeranthus rugospermus (Holz.) Kiger	Prairie Fameflower
Philadelphus lewisii Pursh	Lewis' mock orange
Philadelphus microphyllus A. Gray	littleleaf mock orange
Philadelphus texensis Hu	Texas Mock Orange
Philadelphus texensis var. ernestii (S.Y.Hu) Henrickson	Canyon Mock Orange
Phleum alpinum L.	Alpine Timothy
Phlox alyssifolia Greene	alyssumleaf phlox
Phlox andicola E.E. Nelson	prairie phlox
Phlox bifida Beck	cleft phlox
Phlox condensata (A. Gray) E.E. Nelson	Dwarf Phlox
Phlox cuspidata Scheele	pointed phlox
Phlox divaricata L.	wild blue phlox
Phlox glabriflora (Brand) Whitehouse	Rio Grande phlox
Phlox hoodii Richardson	spiny phlox
Phlox kelseyi Britton	Kelsey's Phlox
Phlox longifolia Nutt.	longleaf phlox
Phlox maculata L.	Wild Sweetwilliam
Phlox multiflora A. Nelson	flowery phlox
Phlox nana Nutt.	Santa Fe phlox
Phlox oklahomensis Wherry	Oklahoma Phlox
Phlox pilosa L.	Downy Phlox
Phlox pulvinata (Wherry) Cronquist	Cushion Phlox
Phlox roemeriana Scheele	goldeneye phlox
Phoradendron bolleanum (Seem.) Eichl.	Bollean mistletoe
Phoradendron hawksworthii (Wiens) Wiens	Hawksworth's mistletoe
Phoradendron juniperinum Engelm. ex A. Gray	Juniper Mistletoe
Phoradendron leucarpum (Raf.) Reveal & M.C. Johnst.	Oak Mistletoe
Phragmites americanus (Saltonst., P.M.Peterson & Soreng) A.Haines	American Common Reed
Phryma leptostachya L.	American lopseed
Phyla cuneifolia (Torr.) Greene	wedgeleaf
Phyla fruticosa (Mill.) Kennedy	diamondleaf fogfruit
Phyla lanceolata (Michx.) Greene	Lanceleaf Fogfruit
Phyla nodiflora (L.) Greene	Turkey Tangle Fogfruit
Phyllanthopsis phyllanthoides (Nutt.) Voronts. & Petra Hoffm.	Missouri Maidenbush
Phyllanthus abnormis Baill.	Drummond's leaf-flower
Phyllanthus caroliniensis Walter	Carolina leaf-flower
Phyllanthus polygonoides Nutt. ex Spreng.	smartweed leaf-flower
Phyllodoce empetriformis (Sm.) D. Don	pink mountainheath
Physalis acutifolia (Miers) Sandw.	Sharpleaf Groundcherry
Physalis angulata L.	Cutleaf Groundcherry
Physalis cinerascens (Dunal) Hitchc.	Smallflower Groundcherry
Physalis cordata Mill.	heartleaf groundcherry
Physalis hederifolia A. Gray	ivyleaf groundcherry
Physalis heterophylla Nees	Clammy Groundcherry
Physalis longifolia Nutt.	Longleaf Groundcherry
Physalis missouriensis Mack. & Bush	Missouri groundcherry
Physalis pumila Nutt.	Dwarf Groundcherry
Physalis pumila var. hispida (Waterf.) J.R.Sullivan	Prairie Groundcherry
Physalis subulata Rydb.	Chihuahuan groundcherry
Physalis virginiana Mill.	Virginia groundcherry
Physalis viscosa L.	Starhair Groundcherry
Physaria acutifolia Rydb.	sharpleaf twinpod
Physaria brassicoides Rydb.	Double Twinpod
Physaria didymocarpa (Hook.) A. Gray	common twinpod
Physaria fendleri (A.Gray) O'Kane & Al-Shehbaz	Fendler's Bladderpod
Physaria gordonii (A.Gray) O'Kane & Al-Shehbaz	Gordon's Bladderpod
Physaria ludoviciana (Nutt.) O'Kane & Al-Shehbaz	Foothill Bladderpod
Physaria reediana O'Kane & Al-Shehbaz	Reed's Twinpod
Physaria saximontana Rollins	Fremont County twinpod
Physaria vitulifera Rydb.	Roundtip Twinpod
Physocarpus malvaceus (Greene) Kuntze	mallow ninebark
Physocarpus monogynus (Torr.) J.M. Coult.	mountain ninebark
Physocarpus opulifolius	Common Ninebark
Physostegia angustifolia Fernald	narrowleaf false dragonhead
Physostegia correllii (Lundell) Shinners	Correll's false dragonhead
Physostegia digitalis Small	finger false dragonhead
Physostegia intermedia (Nutt.) Engelm. & A. Gray	slender false dragonhead
Physostegia ledinghamii (B. Boivin) Cantino	Ledingham's false dragonhead
Physostegia longisepala Cantino	longsepal false dragonhead
Physostegia parviflora Nutt. ex A. Gray	Western False Dragonhead
Physostegia pulchella Lundell	showy false dragonhead
Picea engelmannii Parry ex Engelm.	Engelmann Spruce
Picea glauca (Moench) Voss	White Spruce	✓
Picea mariana	Black Spruce	✓
Picea pungens Engelm.	Blue Spruce
Picradeniopsis oppositifolia (Nutt.) Rydb. ex Britton	oppositeleaf bahia
Picradeniopsis woodhousei (A. Gray) Rydb.	Woodhouse's Bahia
Pilea fontana (Lunell) Rydb.	Black-fruited Clearweed
Pilea pumila (L.) A. Gray	Canadian Clearweed
Pilostyles thurberi A. Gray	Thurber's stemsucker
Pilularia americana A. Braun	American pillwort
Pinaropappus roseus (Less.) Less.	white rocklettuce
Pinguicula pumila Michx.	small butterwort
Pinus albicaulis Engelm.	Whitebark Pine
Pinus aristata Engelm.	bristlecone pine
Pinus contorta Douglas ex Loudon	Lodgepole Pine
Pinus echinata Mill.	Shortleaf Pine	✓
Pinus edulis Engelm.	Twoneedle Pinyon
Pinus elliottii Engelm.	Slash Pine
Pinus flexilis James	Limber Pine
Pinus palustris Mill.	Longleaf Pine
Pinus remota (Little) D.K. Bailey & Hawksw.	papershell pinyon
Pinus strobiformis Engelm.	southwestern white pine
Pinus taeda L.	Loblolly Pine	✓
Piperia unalascensis (Spreng.) Rydb.	slender-spire orchid
Piptatheropsis exigua (Thurb.) Romasch., P.M. Peterson & R.J. Soreng	Little Ricegrass
Piptatheropsis micrantha "(Trin. & Rupr.) Romasch.	littleseed ricegrass
Piptatheropsis pungens "(Torr.) Romasch.	mountain ricegrass
Piptochaetium avenaceum (L.) Parodi	blackseed speargrass
Piptochaetium pringlei (Beal) Parodi	Pringle's speargrass
Pisonia aculeata L.	pullback
Pityopsis graminifolia (Michx.) Nutt.	narrowleaf silkgrass
Plagiobothrys leptocladus (Greene) I.M. Johnst.	finebranched popcornflower
Planera aquatica J.F. Gmel.	Planertree
Plantago canescens M.F. Adams	gray pubescent plantain
Plantago cordata Lam.	heartleaf plantain
Plantago eriopoda Torr.	redwool plantain
Plantago helleri Small	Heller's plantain
Plantago heterophylla Nutt.	slender plantain
Plantago pusilla Nutt.	Dwarf Plantain
Plantago rugelii Decne.	Blackseed Plantain
Plantago virginica L.	Virginia Plantain
Platanthera aquilonis Sheviak	northern green orchid
Platanthera flava (L.) Lindl.	palegreen orchid
Platanthera hookeri (Torr. ex A. Gray) Lindl.	Hooker's orchid
Platanthera huronensis (Nutt.) Lindl.	Huron green orchid
Platanthera lacera (Michx.) G. Don	Green Fringed Orchid
Platanthera leucophaea (Nutt.) Lindl.	Prairie White Fringed Orchid
Platanthera nivea (Nutt.) Luer	snowy orchid
Platanthera obtusata (Banks ex Pursh) Lindl.	bluntleaved orchid
Platanthera praeclara Sheviak & Bowles	Great Plains white fringed orchid
Platanthera psycodes (L.) Lindl.	Lesser Purple Fringed Orchid
Platanthera sparsiflora (S. Watson) Schltr.	sparse-flowered bog orchid
Platanthera stricta Lindl.	slender bog orchid
Platanthera tescamnis Sheviak & W.F. Jenn.	Intermountain Bog Orchid
Platanus occidentalis L.	American Sycamore	✓
Plectocephalus americanus (Nutt.) D.Don	American Star-thistle
Pleopeltis polypodioides (L.) Andrews & Windham	resurrection fern
Pleuraphis mutica Buckley	tobosagrass
Pluchea camphorata (L.) DC.	camphor pluchea
Pluchea carolinensis (Jacq.) G. Don	cure for all
Pluchea foetida (L.) DC.	stinking camphorweed
Pluchea odorata (L.) Cass.	sweetscent
Plumbago zeylanica L.	Doctorbush
Poa abbreviata R. Br.	short bluegrass
Poa alpina L.	Alpine Bluegrass
Poa arachnifera Torr.	Texas Bluegrass
Poa arctica R. Br.	arctic bluegrass
Poa arida Vasey	Plains Bluegrass
Poa autumnalis Muhl. ex Elliott	autumn bluegrass
Poa bigelovii Vasey & Scribn.	Bigelow's bluegrass
Poa chapmaniana Scribn.	Chapman's Bluegrass
Poa cusickii Vasey	Cusick's Bluegrass
Poa fendleriana (Steud.) Vasey	muttongrass
Poa glauca Vahl	Glaucous Bluegrass
Poa leptocoma Trin.	marsh bluegrass
Poa lettermanii Vasey	Letterman's bluegrass
Poa occidentalis Vasey	New Mexico bluegrass
Poa paludigena Fernald & Wiegand	bog bluegrass
Poa reflexa Vasey & Scribn. ex Vasey	Nodding Bluegrass
Poa saltuensis Fernald & Wiegand	oldpasture bluegrass
Poa secunda J. Presl	Sandberg Bluegrass
Poa sylvestris A. Gray	woodland bluegrass
Poa tracyi Vasey	Tracy's Bluegrass
Poa wheeleri Vasey	Wheeler's Bluegrass
Poa wolfii Scribn.	Wolf's bluegrass
Podistera eastwoodiae (J.M. Coult. & Rose) Mathias & Constance	Eastwood's Podistera
Podophyllum peltatum L.	Mayapple	✓
Polanisia dodecandra (L.) DC.	redwhisker clammyweed
Polanisia erosa (Nutt.) Iltis	large clammyweed
Polanisia jamesii (Torr. & A. Gray) Iltis	James' clammyweed
Polanisia uniglandulosa (Cav.) DC.	Mexican clammyweed
Polemonium foliosissimum A. Gray	towering Jacob's-ladder
Polemonium micranthum Benth.	annual polemonium
Polemonium pulcherrimum Hook.	Jacob's-ladder
Polemonium reptans L.	Jacob's Ladder
Polemonium viscosum Nutt.	Sticky Polemonium
Polygaloides paucifolia (Willd.) J.R.Abbott	Gaywings
Polygonatum biflorum (Walter) Elliott	Smooth Solomon's Seal
Polygonatum pubescens (Willd.) Pursh	hairy Solomon's seal
Polygonum achoreum S.F. Blake	leathery knotweed
Polygonum douglasii Greene	Douglas' knotweed
Polygonum erectum L.	Erect Knotweed
Polygonum ramosissimum Michx.	Bushy Knotweed
Polygonum striatulum B.L. Rob.	Striped Knotweed
Polygonum tenue Michx.	pleatleaf knotweed
Polymnia canadensis L.	whiteflower leafcup
Polypodium saximontanum Windham	Rocky Mountain Polypody
Polypodium virginianum L.	rock polypody
Polypogon interruptus Kunth	ditch rabbitsfoot grass
Polypremum procumbens L.	Rustweed
Polystichum acrostichoides (Michx.) Schott	Christmas fern
Polystichum lonchitis (L.) Roth	Northern Hollyfern
Polytaenia albiflora E.L. Keith	White Flowered Prairie Parsley
Polytaenia nuttallii DC.	Nuttall's Prairie Parsley
Polytaenia texana (J.M. Coult. & Rose) Mathias & Constance	Texas Prairie Parsley
Pomaria austrotexana B. Simpson	Texas holdback
Pomaria brachycarpa (A. Gray) B. Simpson	Broadpod Nicker
Pontederia cordata L.	Pickerelweed
Poolea reverchonii (A.Gray) Morin	Basin Bellflower
Populus angustifolia James	Narrowleaf Cottonwood
Populus deltoides W. Bartram ex Marshall	Eastern Cottonwood
Populus grandidentata Michx.	Large-tooth Aspen
Populus tremuloides Michx.	Quaking Aspen
Portulaca halimoides L.	silkcotton purslane
Portulaca pilosa L.	kiss me quick
Potamogeton alpinus Balbis	alpine pondweed
Potamogeton amplifolius Tuck.	largeleaf pondweed
Potamogeton diversifolius Raf.	waterthread pondweed
Potamogeton epihydrus Raf.	ribbonleaf pondweed
Potamogeton foliosus Raf.	Leafy Pondweed
Potamogeton friesii Rupr.	Fries' pondweed
Potamogeton gramineus L.	variableleaf pondweed
Potamogeton illinoensis Morong	Illinois Pondweed
Potamogeton natans L.	floating pondweed
Potamogeton nodosus Poir.	longleaf pondweed
Potamogeton praelongus Wulfen	whitestem pondweed
Potamogeton pulcher Tuck.	spotted pondweed
Potamogeton pusillus L.	small pondweed
Potamogeton richardsonii (Benn.) Rydb.	Richardson's pondweed
Potamogeton spirillus Tuck.	spiral pondweed
Potamogeton strictifolius Benn.	narrowleaf pondweed
Potamogeton vaseyi J.W. Robbins	Vasey's pondweed
Potamogeton zosteriformis Fernald	flatstem pondweed
Potentilla ambigens Greene	Silkyleaf Cinquefoil
Potentilla biennis Greene	biennial cinquefoil

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