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    Indexes to accepted names and synonyms:
    (synonyms indicated with asterisks)
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Packera bernardina
Packera bolanderi var. bolanderi
Packera breweri
Packera cana
Packera clevelandii
Packera eurycephala
Packera eurycephala var. eurycephala
Packera eurycephala var. lewisrosei
Packera ganderi
Packera greenei
Packera hesperia
Packera indecora
Packera ionophylla
Packera layneae
Packera macounii
Packera multilobata
Packera pauciflora
Packera pseudaurea var. pseudaurea
Packera streptanthifolia var. streptanthifolia
Packera subnuda var. subnuda
Packera werneriifolia
Paeonia brownii
Paeonia californica
Palafoxia arida
Palafoxia arida var. arida
Palafoxia arida var. gigantea
Pancratium maritimum
Panicum acuminatum
Panicum acuminatum var. fasciculatum
Panicum acuminatum var. lindheimeri
Panicum acuminatum var. thermale
Panicum antidotale
Panicum capillare
Panicum capillare subsp. hillmanii* (under Panicum hillmanii)
Panicum dichotomiflorum subsp. dichotomiflorum
Panicum hillmanii
Panicum hirticaule subsp. hirticaule
Panicum huachucae* (under Panicum acuminatum var. fasciculatum)
Panicum lassenianum* (under Panicum acuminatum var. thermale)
Panicum lindheimeri* (under Panicum acuminatum var. lindheimeri)
Panicum miliaceum subsp. miliaceum
Panicum occidentale* (under Panicum acuminatum var. fasciculatum)
Panicum oligosanthes var. scribnerianum
Panicum pacificum* (under Panicum acuminatum var. fasciculatum)
Panicum rigidulum subsp. rigidulum
Panicum scribnerianum* (under Panicum oligosanthes var. scribnerianum)
Panicum thermale* (under Panicum acuminatum var. thermale)
Panicum urvilleanum
Papaver apulum var. micranthum* (under Papaver hybridum)
Papaver argemone
Papaver californicum
Papaver heterophyllum
Papaver hybridum
Papaver rhoeas
Papaver somniferum
Pappostipa speciosa* (under Stipa speciosa)
Parapholis incurva
Parapholis strigosa
Paraserianthes lophantha* (under Albizia lophantha)
Parentucellia latifolia
Parentucellia viscosa
Parietaria hespera
Parietaria hespera var. californica
Parietaria hespera var. hespera
Parietaria judaica
Parietaria pensylvanica
Parishella californica* (under Nemacladus californicus)
Parkinsonia aculeata
Parkinsonia florida
Parkinsonia microphylla
Parnassia californica* (under Parnassia palustris)
Parnassia cirrata
Parnassia cirrata var. cirrata
Parnassia cirrata var. intermedia
Parnassia fimbriata
Parnassia palustris
Parnassia palustris var. parviflora* (under Parnassia parviflora)
Parnassia parviflora
Paronychia ahartii
Paronychia echinulata var. echinulata
Paronychia franciscana
Parrya menziesii var. glabra* (under Phoenicaulis cheiranthoides)
Parthenocissus inserta
Parthenocissus vitacea* (under Parthenocissus inserta)
Parvisedum congdonii* (under Sedella pumila)
Parvisedum leiocarpum* (under Sedella leiocarpa)
Parvisedum pentandrum* (under Sedella pentandra)
Parvisedum pumilum* (under Sedella pumila)
Pascopyrum smithii* (under Elymus smithii)
Paspalum dilatatum
Paspalum distichum
Paspalum distichum var. indutum* (under Paspalum distichum)
Paspalum notatum* (under Paspalum)
Paspalum paspalodes* (under Paspalum distichum)
Paspalum urvillei
Paspalum vaginatum
Passiflora caerulea
Passiflora mollissima* (under Passiflora tarminiana)
Passiflora tarminiana
Pastinaca sativa
Paxistima myrsinites
Pectiantia breweri
Pectiantia ovalis
Pectiantia pentandra
Pectis papposa var. papposa
Pectocarya heterocarpa
Pectocarya linearis subsp. ferocula
Pectocarya penicillata
Pectocarya peninsularis
Pectocarya platycarpa
Pectocarya pusilla
Pectocarya recurvata
Pectocarya setosa
Pedicularis attollens
Pedicularis aurantiaca* (under Pedicularis densiflora)
Pedicularis bracteosa var. flavida
Pedicularis centranthera
Pedicularis contorta
Pedicularis crenulata
Pedicularis crenulata f. candida* (under Pedicularis crenulata)
Pedicularis densiflora
Pedicularis densiflora subsp. aurantiaca* (under Pedicularis densiflora)
Pedicularis dudleyi
Pedicularis flavida* (under Pedicularis bracteosa var. flavida)
Pedicularis groenlandica
Pedicularis groenlandica var. surrecta* (under Pedicularis groenlandica)
Pedicularis howellii
Pedicularis racemosa
Pedicularis semibarbata
Pedicularis semibarbata subsp. charlestonensis* (under Pedicularis semibarbata)
Pediomelum californicum
Pediomelum castoreum
Peganum harmala
Pelargonium ×hortorum
Pelargonium capitatum
Pelargonium grossularioides
Pelargonium inquinans
Pelargonium panduriforme
Pelargonium peltatum
Pelargonium quercifolium* (under Pelargonium)
Pelargonium vitifolium
Pelargonium zonale
Pellaea andromedifolia
Pellaea brachyptera
Pellaea breweri
Pellaea bridgesii
Pellaea mucronata
Pellaea mucronata var. californica
Pellaea mucronata var. mucronata
Pellaea truncata
Peltandra virginica
Pennisetum ciliare
Pennisetum clandestinum
Pennisetum setaceum
Pennisetum villosum
Penstemon albomarginatus
Penstemon anguineus
Penstemon azureus
Penstemon azureus var. angustissimus
Penstemon azureus var. azureus
Penstemon barnebyi
Penstemon bicolor
Penstemon bridgesii* (under Penstemon rostriflorus)
Penstemon bryantiae* (under Penstemon palmeri var. palmeri)
Penstemon caesius
Penstemon calcareus
Penstemon californicus
Penstemon centranthifolius
Penstemon cinicola
Penstemon clevelandii
Penstemon clevelandii var. clevelandii
Penstemon clevelandii var. connatus
Penstemon clevelandii var. mohavensis
Penstemon confusus subsp. patens* (under Penstemon patens)
Penstemon davidsonii var. davidsonii
Penstemon deustus
Penstemon deustus subsp. heterander* (under Penstemon deustus var. pedicellatus)
Penstemon deustus subsp. sudans* (under Penstemon sudans)
Penstemon deustus var. deustus
Penstemon deustus var. pedicellatus
Penstemon deustus var. savagei* (under Penstemon deustus var. suffrutescens)
Penstemon deustus var. suffrutescens
Penstemon eatonii
Penstemon eatonii var. eatonii
Penstemon eatonii var. undosus
Penstemon filiformis
Penstemon floridus
Penstemon floridus var. austinii
Penstemon floridus var. floridus
Penstemon fruticiformis
Penstemon fruticiformis var. amargosae
Penstemon fruticiformis var. fruticiformis
Penstemon gracilentus
Penstemon grinnellii
Penstemon grinnellii var. grinnellii
Penstemon grinnellii var. scrophularioides
Penstemon heterodoxus
Penstemon heterodoxus var. cephalophorus
Penstemon heterodoxus var. heterodoxus
Penstemon heterodoxus var. shastensis
Penstemon heterophyllus
Penstemon heterophyllus var. australis
Penstemon heterophyllus var. heterophyllus
Penstemon heterophyllus var. purdyi
Penstemon hians* (under Penstemon grinnellii var. grinnellii)
Penstemon humilis var. humilis
Penstemon incertus
Penstemon janishiae
Penstemon labrosus
Penstemon laetus
Penstemon laetus subsp. roezlii* (under Penstemon roezlii)
Penstemon laetus var. laetus
Penstemon laetus var. leptosepalus
Penstemon laetus var. sagittatus
Penstemon miser* (under Penstemon janishiae)
Penstemon monoensis
Penstemon nemorosus* (under Nothochelone nemorosa)
Penstemon neotericus
Penstemon newberryi
Penstemon newberryi var. berryi
Penstemon newberryi var. newberryi
Penstemon newberryi var. sonomensis
Penstemon pahutensis
Penstemon palmeri var. palmeri
Penstemon papillatus
Penstemon parvulus
Penstemon patens
Penstemon peirsonii* (under Penstemon grinnellii var. scrophularioides)
Penstemon personatus
Penstemon procerus
Penstemon procerus var. brachyanthus
Penstemon procerus var. formosus
Penstemon pseudospectabilis
Penstemon purpusii
Penstemon rattanii
Penstemon rattanii var. kleei
Penstemon rattanii var. rattanii
Penstemon roezlii
Penstemon rostriflorus
Penstemon rupicola
Penstemon rydbergii var. oreocharis
Penstemon scapoides
Penstemon speciosus
Penstemon speciosus subsp. kennedyi* (under Penstemon speciosus)
Penstemon spectabilis
Penstemon spectabilis var. spectabilis
Penstemon spectabilis var. subviscosus
Penstemon stephensii
Penstemon sudans
Penstemon thompsoniae
Penstemon thurberi
Penstemon tracyi
Penstemon utahensis
Penstemon venustus
Pentachaeta alsinoides
Pentachaeta aurea
Pentachaeta aurea subsp. allenii
Pentachaeta aurea subsp. aurea
Pentachaeta bellidiflora
Pentachaeta exilis
Pentachaeta exilis subsp. aeolica
Pentachaeta exilis subsp. exilis
Pentachaeta fragilis
Pentachaeta lyonii
Pentagramma pallida
Pentagramma triangularis
Pentagramma triangularis subsp. maxonii
Pentagramma triangularis subsp. triangularis
Pentagramma triangularis subsp. viscosa
Pentaphylloides fruticosa* (under Dasiphora fruticosa)
Peraphyllum ramosissimum
Pericome caudata
Perideridia bacigalupii
Perideridia bolanderi
Perideridia bolanderi subsp. bolanderi
Perideridia bolanderi subsp. involucrata
Perideridia californica
Perideridia gairdneri
Perideridia gairdneri subsp. borealis
Perideridia gairdneri subsp. gairdneri
Perideridia howellii
Perideridia kelloggii
Perideridia lemmonii
Perideridia leptocarpa
Perideridia oregana
Perideridia parishii
Perideridia parishii subsp. latifolia
Perideridia parishii subsp. parishii
Perideridia pringlei
Peritoma arborea
Peritoma arborea var. angustata
Peritoma arborea var. arborea
Peritoma arborea var. globosa
Peritoma jonesii
Peritoma lutea
Peritoma platycarpa
Peritoma serrulata
Perityle emoryi
Perityle intricata
Perityle inyoensis
Perityle megalocephala
Perityle megalocephala var. intricata* (under Perityle intricata)
Perityle megalocephala var. megalocephala
Perityle megalocephala var. oligophylla
Perityle villosa
Persea americana
Persicaria amphibia
Persicaria capitata
Persicaria coccinea* (under Persicaria amphibia)
Persicaria hydropiper
Persicaria hydropiperoides
Persicaria lapathifolia
Persicaria maculosa
Persicaria orientalis
Persicaria pensylvanica
Persicaria punctata
Persicaria wallichii
Petalonyx gilmanii* (under Petalonyx thurberi subsp. gilmanii)
Petalonyx linearis
Petalonyx nitidus
Petalonyx thurberi
Petalonyx thurberi subsp. gilmanii
Petalonyx thurberi subsp. thurberi
Petasites frigidus var. palmatus
Peteria thompsoniae
Petradoria pumila subsp. pumila* (under Petradoria pumila var. pumila)
Petradoria pumila var. pumila
Petrophyton caespitosum subsp. acuminatum* (under Petrophytum caespitosum subsp. acuminatum)
Petrophyton caespitosum subsp. caespitosum* (under Petrophytum caespitosum subsp. caespitosum)
Petrophyton caespitosum* (under Petrophytum caespitosum)
Petrophytum caespitosum
Petrophytum caespitosum subsp. acuminatum
Petrophytum caespitosum subsp. caespitosum
Petrorhagia dubia
Petrorhagia nanteuilii
Petrorhagia prolifera
Petroselinum crispum
Petunia parviflora
Peucephyllum schottii
Phacelia adenophora
Phacelia affinis
Phacelia amabilis
Phacelia anelsonii
Phacelia argentea
Phacelia austromontana
Phacelia barnebyana
Phacelia bicolor
Phacelia bicolor var. bicolor* (under Phacelia bicolor)
Phacelia bolanderi
Phacelia brachyloba
Phacelia breweri
Phacelia californica
Phacelia calthifolia
Phacelia campanularia
Phacelia campanularia subsp. campanularia* (under Phacelia campanularia var. campanularia)
Phacelia campanularia subsp. vasiformis* (under Phacelia campanularia var. vasiformis)
Phacelia campanularia var. campanularia
Phacelia campanularia var. vasiformis
Phacelia cicutaria
Phacelia cicutaria var. cicutaria
Phacelia cicutaria var. hispida
Phacelia ciliata
Phacelia coerulea
Phacelia congdonii
Phacelia cookei
Phacelia corymbosa
Phacelia crenulata
Phacelia crenulata var. ambigua
Phacelia crenulata var. crenulata
Phacelia crenulata var. minutiflora
Phacelia cryptantha
Phacelia curvipes
Phacelia dalesiana* (under Howellanthus dalesianus)
Phacelia davidsonii
Phacelia distans
Phacelia divaricata
Phacelia douglasii
Phacelia egena
Phacelia eisenii
Phacelia exilis
Phacelia floribunda
Phacelia fremontii
Phacelia glandulifera
Phacelia grandiflora
Phacelia greenei
Phacelia grisea
Phacelia gymnoclada
Phacelia hastata
Phacelia hastata subsp. compacta* (under Phacelia hastata var. compacta)
Phacelia hastata subsp. hastata* (under Phacelia hastata var. hastata)
Phacelia hastata var. compacta
Phacelia hastata var. hastata
Phacelia heterophylla subsp. virgata* (under Phacelia heterophylla var. virgata)
Phacelia heterophylla var. virgata
Phacelia hubbyi
Phacelia humilis
Phacelia humilis var. dudleyi
Phacelia humilis var. humilis
Phacelia hydrophylloides
Phacelia imbricata
Phacelia imbricata subsp. imbricata* (under Phacelia imbricata var. bernardina) (under Phacelia imbricata var. imbricata)
Phacelia imbricata subsp. patula* (under Phacelia imbricata var. patula)
Phacelia imbricata var. bernardina
Phacelia imbricata var. imbricata
Phacelia imbricata var. patula
Phacelia insularis
Phacelia insularis var. continentis
Phacelia insularis var. insularis
Phacelia inundata
Phacelia inyoensis
Phacelia ivesiana
Phacelia ixodes* (under Phacelia)
Phacelia keckii
Phacelia lemmonii
Phacelia leonis
Phacelia linearis
Phacelia longipes
Phacelia lyonii
Phacelia malvifolia
Phacelia malvifolia var. loasifolia
Phacelia malvifolia var. malvifolia
Phacelia malvifolia* (under Phacelia malvifolia var. loasifolia) (under Phacelia malvifolia var. malvifolia)
Phacelia marcescens
Phacelia minor
Phacelia mohavensis
Phacelia monoensis
Phacelia mustelina
Phacelia mutabilis
Phacelia nashiana
Phacelia neglecta
Phacelia nemoralis
Phacelia nemoralis subsp. nemoralis* (under Phacelia nemoralis var. nemoralis)
Phacelia nemoralis subsp. oregonensis* (under Phacelia nemoralis var. oregonensis)
Phacelia nemoralis var. nemoralis
Phacelia nemoralis var. oregonensis
Phacelia novenmillensis
Phacelia orogenes
Phacelia pachyphylla
Phacelia parishii
Phacelia parryi
Phacelia pedicellata
Phacelia peirsoniana
Phacelia perityloides
Phacelia perityloides var. jaegeri
Phacelia perityloides var. perityloides
Phacelia phacelioides
Phacelia platyloba
Phacelia pringlei
Phacelia procera
Phacelia pulchella var. gooddingii
Phacelia purpusii
Phacelia quickii
Phacelia racemosa
Phacelia ramosissima
Phacelia rattanii
Phacelia rotundifolia
Phacelia saxicola
Phacelia sericea var. ciliosa
Phacelia stebbinsii
Phacelia stellaris
Phacelia suaveolens
Phacelia suaveolens var. suaveolens* (under Phacelia suaveolens)
Phacelia tanacetifolia
Phacelia tetramera
Phacelia thermalis
Phacelia umbrosa
Phacelia vallicola
Phacelia vallis-mortae
Phacelia viscida
Phacelia viscida var. albiflora
Phacelia viscida var. viscida
Phalacroseris bolanderi
Phalacroseris bolanderi var. coronata* (under Phalacroseris bolanderi)
Phalaris americana* (under Phalaris caroliniana)
Phalaris amethystina* (under Phalaris californica)
Phalaris angusta
Phalaris aquatica
Phalaris arundinacea
Phalaris brachystachys
Phalaris bulbosa* (under Phalaris aquatica) (under Phalaris coerulescens)
Phalaris californica
Phalaris canariensis
Phalaris caroliniana
Phalaris coerulescens
Phalaris commutata* (under Phalaris aquatica)
Phalaris intermedia var. angusta* (under Phalaris angusta)
Phalaris intermedia var. angustata* (under Phalaris angusta)
Phalaris intermedia* (under Phalaris caroliniana)
Phalaris lemmonii
Phalaris microstachya* (under Phalaris caroliniana)
Phalaris minor
Phalaris occidentalis* (under Phalaris caroliniana)
Phalaris paradoxa
Phalaris paradoxa var. coerulescens* (under Phalaris coerulescens)
Phalaris paradoxa var. praemorsa* (under Phalaris paradoxa)
Phalaris praemorsa* (under Phalaris paradoxa)
Phalaris stenoptera* (under Phalaris aquatica)
Phalaris trivialis* (under Phalaris caroliniana)
Phalaris tuberosa var. stenoptera* (under Phalaris aquatica)
Phalaris tuberosa* (under Phalaris aquatica)
Phaseolus filiformis
Philadelphus lewisii
Philadelphus lewisii subsp. californicus* (under Philadelphus lewisii)
Philadelphus lewisii subsp. gordonianus* (under Philadelphus lewisii)
Philadelphus microphyllus
Philadelphus microphyllus subsp. pumilus* (under Philadelphus microphyllus)
Philadelphus microphyllus subsp. stramineus* (under Philadelphus microphyllus)
Philadelphus microphyllus var. stramineus* (under Philadelphus microphyllus)
Phleum alpinum
Phleum pratense
Phlox adsurgens
Phlox austromontana
Phlox caespitosa subsp. pulvinata* (under Phlox pulvinata)
Phlox condensata
Phlox diffusa
Phlox dispersa
Phlox dolichantha
Phlox douglasii
Phlox douglasii subsp. rigida* (under Phlox douglasii)
Phlox gracilis* (under Microsteris gracilis)
Phlox hirsuta
Phlox hoodii subsp. canescens
Phlox muscoides
Phlox pulvinata
Phlox speciosa
Phlox speciosa subsp. nitida* (under Phlox speciosa)
Phlox speciosa subsp. occidentalis* (under Phlox speciosa)
Phlox stansburyi
Phlox stansburyi subsp. stansburyi
Phlox stansburyi subsp. superba
Phlox stansburyi var. brevifolia
Phoenicaulis cheiranthoides
Phoenicaulis cheiranthoides subsp. glabra* (under Phoenicaulis cheiranthoides)
Phoenicaulis cheiranthoides var. lanuginosa* (under Phoenicaulis cheiranthoides)
Phoenicaulis eurycarpa* (under Anelsonia eurycarpa)
Phoenix canariensis
Phoenix dactylifera
Pholisma arenarium
Pholisma sonorae
Pholistoma auritum
Pholistoma auritum var. arizonicum
Pholistoma auritum var. auritum
Pholistoma membranaceum
Pholistoma racemosum
Phoradendron bolleanum
Phoradendron californicum
Phoradendron densum* (under Phoradendron bolleanum)
Phoradendron juniperinum
Phoradendron leucarpum
Phoradendron leucarpum subsp. macrophyllum
Phoradendron leucarpum subsp. tomentosum
Phoradendron libocedri* (under Phoradendron juniperinum)
Phoradendron macrophyllum* (under Phoradendron leucarpum subsp. macrophyllum)
Phoradendron pauciflorum* (under Phoradendron bolleanum)
Phoradendron serotinum subsp. macrophyllum* (under Phoradendron leucarpum subsp. macrophyllum)
Phoradendron serotinum subsp. tomentosum* (under Phoradendron leucarpum subsp. tomentosum)
Phoradendron serotinum* (under Phoradendron leucarpum)
Phoradendron villosum* (under Phoradendron leucarpum subsp. tomentosum)
Phragmites australis
Phragmites australis var. berlandieri* (under Phragmites australis)
Phragmites berlandieri* (under Phragmites australis)
Phragmites communis var. berlandieri* (under Phragmites australis)
Phragmites communis* (under Phragmites australis)
Phyla lanceolata
Phyla nodiflora
Phyla nodiflora var. canescens* (under Phyla nodiflora)
Phyla nodiflora var. incisa* (under Phyla nodiflora)
Phyla nodiflora var. reptans* (under Phyla nodiflora)
Phyla nodiflora var. rosea* (under Phyla nodiflora)
Phyllodoce breweri
Phyllodoce empetriformis
Phyllospadix scouleri
Phyllospadix torreyi
Phyllostachys aurea
Physalis acutifolia
Physalis angulata var. lancifolia* (under Physalis lancifolia)
Physalis crassifolia
Physalis hederifolia
Physalis hederifolia var. fendleri
Physalis hederifolia var. palmeri
Physalis lancifolia
Physalis lobata
Physalis longifolia
Physalis philadelphica
Physalis pubescens
Physalis pubescens var. grisea
Physalis pubescens var. integrifolia
Physalis viscosa
Physaria chambersii
Physaria cordiformis
Physaria kingii
Physaria kingii subsp. bernardina
Physaria kingii subsp. kingii
Physaria kingii subsp. latifolia
Physaria ludoviciana
Physaria occidentalis subsp. occidentalis
Physaria tenella
Physaria wardii* (under Physaria kingii subsp. latifolia)
Physocarpus alternans
Physocarpus capitatus
Phytolacca americana var. americana
Phytolacca heterotepala
Phytolacca icosandra
Picea breweriana
Picea engelmannii
Picea sitchensis
Pickeringia montana
Pickeringia montana var. montana
Pickeringia montana var. tomentosa
Picris echioides* (under Helminthotheca echioides)
Picrothamnus desertorum* (under Artemisia spinescens)
Pilostyles thurberi
Pilularia americana
Pinguicula macroceras
Pinguicula vulgaris subsp. macroceras* (under Pinguicula macroceras)
Pinus albicaulis
Pinus attenuata
Pinus balfouriana
Pinus balfouriana subsp. austrina
Pinus balfouriana subsp. balfouriana
Pinus contorta
Pinus contorta subsp. bolanderi
Pinus contorta subsp. contorta
Pinus contorta subsp. murrayana
Pinus coulteri
Pinus edulis
Pinus flexilis
Pinus jeffreyi
Pinus lambertiana
Pinus longaeva
Pinus monophylla
Pinus monticola
Pinus muricata
Pinus ponderosa
Pinus ponderosa var. pacifica
Pinus ponderosa var. ponderosa
Pinus ponderosa var. washoensis
Pinus quadrifolia
Pinus radiata
Pinus sabiniana
Pinus torreyana
Pinus torreyana subsp. insularis
Pinus torreyana subsp. torreyana
Pinus washoensis* (under Pinus ponderosa var. washoensis)
Piperia candida
Piperia colemanii
Piperia cooperi
Piperia elegans
Piperia elegans subsp. decurtata
Piperia elegans subsp. elegans
Piperia elongata
Piperia leptopetala
Piperia michaelii
Piperia transversa
Piperia unalascensis
Piperia yadonii
Piptatherum exiguum* (under Stipa exigua)
Piptatherum micranthum* (under Stipa divaricata)
Piptatherum miliaceum subsp. miliaceum* (under Stipa miliacea var. miliacea)
Piptatherum miliaceum* (under )
Piptochaetium setosum* (under Stipa purpurata)
Piptochaetium stipoides* (under Stipa chaetophora)
Pistacia atlantica
Pistia stratiotes
Pisum sativum
Pittosporum crassifolium
Pittosporum tenuifolium
Pittosporum tobira
Pittosporum undulatum
Pityopus californicus
Pityrogramma triangularis var. pallida* (under Pentagramma pallida)
Plagiobothrys acanthocarpus
Plagiobothrys arizonicus
Plagiobothrys austinae* (under Plagiobothrys austiniae)
Plagiobothrys austiniae
Plagiobothrys bracteatus
Plagiobothrys canescens
Plagiobothrys canescens var. canescens
Plagiobothrys canescens var. catalinensis
Plagiobothrys chorisianus
Plagiobothrys chorisianus var. chorisianus
Plagiobothrys chorisianus var. hickmanii
Plagiobothrys cognatus
Plagiobothrys collinus
Plagiobothrys collinus var. californicus
Plagiobothrys collinus var. fulvescens
Plagiobothrys collinus var. gracilis
Plagiobothrys collinus var. ursinus
Plagiobothrys cusickii
Plagiobothrys diffusus
Plagiobothrys distantiflorus
Plagiobothrys fulvus var. campestris
Plagiobothrys glaber
Plagiobothrys glyptocarpus
Plagiobothrys glyptocarpus var. glyptocarpus
Plagiobothrys glyptocarpus var. modestus
Plagiobothrys greenei
Plagiobothrys hispidulus
Plagiobothrys hispidus
Plagiobothrys humistratus
Plagiobothrys hystriculus
Plagiobothrys infectivus
Plagiobothrys jonesii
Plagiobothrys kingii
Plagiobothrys kingii var. harknessii
Plagiobothrys kingii var. kingii
Plagiobothrys leptocladus
Plagiobothrys lithocaryus
Plagiobothrys mollis
Plagiobothrys mollis var. mollis
Plagiobothrys mollis var. vestitus
Plagiobothrys myosotoides subsp. verrucosus* (under Plagiobothrys verrucosus)
Plagiobothrys myosotoides* (under Plagiobothrys verrucosus)
Plagiobothrys nitens
Plagiobothrys nothofulvus
Plagiobothrys parishii
Plagiobothrys reticulatus
Plagiobothrys reticulatus var. reticulatus
Plagiobothrys reticulatus var. rossianorum
Plagiobothrys salsus
Plagiobothrys scouleri var. penicillatus* (under Plagiobothrys nitens)
Plagiobothrys scriptus
Plagiobothrys shastensis
Plagiobothrys stipitatus
Plagiobothrys stipitatus var. micranthus
Plagiobothrys stipitatus var. stipitatus
Plagiobothrys strictus
Plagiobothrys tenellus
Plagiobothrys tener
Plagiobothrys tener var. subglaber
Plagiobothrys tener var. tener
Plagiobothrys torreyi
Plagiobothrys torreyi var. diffusus
Plagiobothrys torreyi var. perplexans
Plagiobothrys torreyi var. torreyi
Plagiobothrys trachycarpus
Plagiobothrys uncinatus
Plagiobothrys undulatus
Plagiobothrys verrucosus
Planodes virginica
Plantago arenaria
Plantago aristata
Plantago bigelovii* (under Plantago elongata)
Plantago coronopus
Plantago elongata
Plantago elongata subsp. pentasperma* (under Plantago elongata)
Plantago erecta
Plantago eriopoda
Plantago fastigiata* (under Plantago ovata var. fastigiata)
Plantago indica* (under Plantago arenaria)
Plantago insularis* (under Plantago ovata var. insularis)
Plantago lanceolata
Plantago major
Plantago major var. pilgeri* (under Plantago major)
Plantago major var. scopulorum* (under Plantago major)
Plantago maritima
Plantago maritima var. californica* (under Plantago maritima)
Plantago maritima var. juncoides* (under Plantago maritima)
Plantago ovata
Plantago ovata var. fastigiata
Plantago ovata var. insularis
Plantago patagonica
Plantago psyllium* (under Plantago arenaria)
Plantago purshii* (under Plantago patagonica)
Plantago pusilla
Plantago rhodosperma
Plantago subnuda
Plantago truncata subsp. firma
Plantago virginica
Platanthera dilatata var. leucostachys
Platanthera hyperborea var. purpurascens* (under Platanthera yosemitensis)
Platanthera hyperborea* (under Platanthera tescamnis)
Platanthera leucostachys* (under Platanthera dilatata var. leucostachys)
Platanthera purpurascens* (under Platanthera yosemitensis)
Platanthera sparsiflora
Platanthera stricta
Platanthera tescamnis
Platanthera yosemitensis
Platanus ×acerifolia* (under Platanus ×hispanica)
Platanus ×hispanica
Platanus ×hybrida* (under Platanus ×hispanica)
Platanus hispanica* (under Platanus ×hispanica)
Platanus racemosa
Platystemon californicus
Plecostachys serpyllifolia
Plectritis brachystemon* (under Plectritis congesta subsp. brachystemon)
Plectritis ciliosa
Plectritis ciliosa subsp. insignis* (under Plectritis ciliosa)
Plectritis congesta
Plectritis congesta subsp. brachystemon
Plectritis congesta subsp. congesta
Plectritis macrocera
Pleiacanthus spinosus
Pleuraphis jamesii* (under Hilaria jamesii)
Pleuraphis rigida* (under Hilaria rigida)
Pleuricospora fimbriolata
Pleurocoronis pluriseta
Pleuropogon californicus
Pleuropogon californicus var. californicus
Pleuropogon californicus var. davyi
Pleuropogon davyi* (under Pleuropogon californicus var. davyi)
Pleuropogon hooverianus
Pleuropogon refractus
Pluchea odorata var. odorata
Pluchea sericea
Plumbago auriculata
Poa abbreviata
Poa abbreviata subsp. marshii
Poa abbreviata subsp. pattersonii
Poa alpina var. purpurascens* (under Poa cusickii subsp. purpurascens)
Poa annua
Poa atropurpurea
Poa bigelovii
Poa bolanderi
Poa bolanderi var. howellii* (under Poa howellii)
Poa bulbosa
Poa bulbosa subsp. bulbosa
Poa bulbosa subsp. vivipara
Poa canbyi* (under Poa secunda subsp. secunda)
Poa compressa
Poa confinis
Poa cusickii
Poa cusickii subsp. cusickii
Poa cusickii subsp. epilis
Poa cusickii subsp. pallida
Poa cusickii subsp. purpurascens
Poa diaboli
Poa douglasii
Poa douglasii subsp. macrantha* (under Poa macrantha)
Poa epilis* (under Poa cusickii subsp. epilis)
Poa fendleriana
Poa fendleriana subsp. fendleriana
Poa fendleriana subsp. longiligula
Poa glauca subsp. rupicola
Poa gracillima* (under Poa secunda subsp. secunda)
Poa hansenii* (under Poa cusickii subsp. cusickii)
Poa howellii
Poa incurva* (under Poa secunda subsp. secunda)
Poa infirma
Poa keckii
Poa kelloggii
Poa leptocoma subsp. leptocoma
Poa lettermanii
Poa longiligula* (under Poa fendleriana subsp. longiligula)
Poa macrantha
Poa napensis
Poa nemoralis
Poa nervosa* (under Poa wheeleri)
Poa palustris
Poa pattersonii* (under Poa abbreviata subsp. pattersonii)
Poa piperi
Poa pratensis subsp. pratensis
Poa pringlei
Poa purpurascens* (under Poa cusickii subsp. purpurascens)
Poa rhizomata
Poa rhizomata* (under Poa piperi)
Poa rupicola* (under Poa glauca subsp. rupicola)
Poa sandbergii* (under Poa secunda subsp. secunda)
Poa scabrella* (under Poa secunda subsp. secunda)
Poa secunda
Poa secunda subsp. juncifolia
Poa secunda subsp. secunda
Poa sierrae
Poa stebbinsii
Poa subaristata* (under Poa cusickii subsp. pallida)
Poa suksdorfii* (under Poa keckii)
Poa tenerrima
Poa trivialis
Poa unilateralis subsp. unilateralis
Poa wheeleri
Podagrostis humilis* (under Agrostis humilis)
Podagrostis thurberiana* (under Agrostis humilis)
Podistera nevadensis
Pogogyne abramsii
Pogogyne clareana
Pogogyne douglasii
Pogogyne floribunda
Pogogyne nudiuscula
Pogogyne serpylloides
Pogogyne serpylloides subsp. intermedia* (under Pogogyne serpylloides)
Pogogyne zizyphoroides
Poinciana spinosa* (under Caesalpinia spinosa)
Polanisia dodecandra subsp. trachysperma
Polemonium californicum
Polemonium carneum
Polemonium chartaceum
Polemonium eximium
Polemonium micranthum
Polemonium occidentale subsp. occidentale
Polemonium pulcherrimum
Polemonium pulcherrimum var. pilosum
Polemonium pulcherrimum var. pulcherrimum
Poliomintha incana
Polycarpon depressum
Polycarpon tetraphyllum var. tetraphyllum
Polyctenium fremontii
Polyctenium fremontii var. confertum* (under Polyctenium fremontii)
Polyctenium fremontii var. fremontii* (under Polyctenium fremontii)
Polyctenium williamsiae* (under Polyctenium fremontii)
Polygala acanthoclada
Polygala acanthoclada var. intricata* (under Polygala intermontana)
Polygala californica
Polygala cornuta
Polygala cornuta subsp. fishiae* (under Polygala cornuta var. fishiae)
Polygala cornuta var. cornuta
Polygala cornuta var. fishiae
Polygala heterorhyncha
Polygala intermontana
Polygala subspinosa
Polygala subspinosa var. heterorhyncha* (under Polygala heterorhyncha)
Polygonum amphibium var. emersum* (under Persicaria amphibia)
Polygonum amphibium var. stipulaceum* (under Persicaria amphibia)
Polygonum amphibium* (under Persicaria amphibia)
Polygonum arenastrum* (under Polygonum aviculare subsp. depressum)
Polygonum argyrocoleon
Polygonum aubertii* (under Fallopia baldschuanica)
Polygonum austiniae
Polygonum aviculare
Polygonum aviculare subsp. aviculare
Polygonum aviculare subsp. buxiforme
Polygonum aviculare subsp. depressum
Polygonum aviculare subsp. neglectum
Polygonum aviculare subsp. rectum* (under Polygonum aviculare subsp. neglectum)
Polygonum aviculare subsp. rurivagum
Polygonum baldschuanicum* (under Fallopia baldschuanica)
Polygonum bidwelliae
Polygonum bistortoides* (under Bistorta bistortoides)
Polygonum bolanderi
Polygonum californicum
Polygonum capitatum* (under Persicaria capitata)
Polygonum convolvulus* (under Fallopia convolvulus)
Polygonum cuspidatum* (under Fallopia japonica)
Polygonum davisiae* (under Aconogonon davisiae)
Polygonum douglasii
Polygonum douglasii subsp. austiniae* (under Polygonum austiniae)
Polygonum douglasii subsp. douglasii* (under Polygonum douglasii)
Polygonum douglasii subsp. johnstonii* (under Polygonum sawatchense subsp. sawatchense)
Polygonum douglasii subsp. majus* (under Polygonum majus)
Polygonum douglasii subsp. spergulariiforme* (under Polygonum spergulariiforme)
Polygonum fowleri subsp. fowleri
Polygonum hickmanii
Polygonum hydropiper* (under Persicaria hydropiper)
Polygonum hydropiperoides* (under Persicaria hydropiperoides)
Polygonum lapathifolium* (under Persicaria lapathifolia)
Polygonum majus
Polygonum marinense
Polygonum minimum
Polygonum neglectum* (under Polygonum aviculare subsp. neglectum)
Polygonum newberryi* (under Aconogonon newberryi)
Polygonum paronychia
Polygonum parryi
Polygonum patulum* (under Polygonum ramosissimum)
Polygonum pensylvanicum* (under Persicaria pensylvanica)
Polygonum persicaria* (under Persicaria maculosa)
Polygonum phytolaccifolium* (under Aconogonon phytolaccifolium)
Polygonum polygaloides
Polygonum polygaloides subsp. confertiflorum
Polygonum polygaloides subsp. esotericum
Polygonum polygaloides subsp. kelloggii
Polygonum polystachyum* (under Persicaria wallichii)
Polygonum prolificum* (under Polygonum ramosissimum subsp. prolificum)
Polygonum punctatum* (under Persicaria punctata)
Polygonum ramosissimum
Polygonum ramosissimum subsp. prolificum
Polygonum ramosissimum subsp. ramosissimum
Polygonum sachalinense* (under Fallopia sachalinensis)
Polygonum sawatchense
Polygonum sawatchense subsp. oblivium
Polygonum sawatchense subsp. sawatchense
Polygonum shastense
Polygonum spergulariiforme
Polygonum triandrum* (under Polygonum sawatchense subsp. sawatchense)
Polypodium californicum
Polypodium calirhiza
Polypodium glycyrrhiza
Polypodium hesperium
Polypodium scouleri
Polypogon australis
Polypogon elongatus* (under Polypogon imberbis)
Polypogon imberbis
Polypogon interruptus
Polypogon maritimus
Polypogon monspeliensis
Polypogon semiverticillatus* (under Polypogon viridis)
Polypogon viridis
Polystichum californicum
Polystichum dudleyi
Polystichum imbricans
Polystichum imbricans subsp. curtum
Polystichum imbricans subsp. imbricans
Polystichum kruckebergii
Polystichum lemmonii
Polystichum lonchitis
Polystichum munitum
Polystichum scopulinum
Populus alba
Populus angustifolia
Populus balsamifera subsp. trichocarpa* (under Populus trichocarpa)
Populus deltoides var. fremontii* (under Populus fremontii subsp. fremontii)
Populus fremontii subsp. fremontii
Populus nigra
Populus nigra var. italica* (under Populus nigra)
Populus tremuloides
Populus trichocarpa
Porophyllum gracile
Porophyllum ruderale var. macrocephalum
Porterella carnosula
Portulaca halimoides
Portulaca oleracea
Potamogeton alpinus
Potamogeton alpinus subsp. tenuifolius* (under Potamogeton alpinus)
Potamogeton amplifolius
Potamogeton berchtoldii
Potamogeton crispus
Potamogeton diversifolius
Potamogeton epihydrus
Potamogeton epihydrus subsp. nuttallii* (under Potamogeton epihydrus)
Potamogeton filiformis var. alpinus* (under Stuckenia filiformis subsp. alpina)
Potamogeton filiformis var. macounii* (under Stuckenia filiformis subsp. alpina)
Potamogeton filiformis* (under Stuckenia filiformis subsp. alpina)
Potamogeton foliosus
Potamogeton foliosus subsp. fibrillosus
Potamogeton foliosus subsp. foliosus
Potamogeton foliosus var. fibrillosus* (under Potamogeton foliosus subsp. fibrillosus)
Potamogeton foliosus var. foliosus* (under Potamogeton foliosus subsp. foliosus)
Potamogeton gramineus
Potamogeton illinoensis
Potamogeton latifolius* (under Stuckenia striata)
Potamogeton natans
Potamogeton nodosus
Potamogeton pectinatus* (under Stuckenia pectinata)
Potamogeton praelongus
Potamogeton pusillus
Potamogeton pusillus subsp. tenuissimus* (under Potamogeton berchtoldii)
Potamogeton pusillus var. pusillus* (under Potamogeton pusillus)
Potamogeton pusillus var. tenuissimus* (under Potamogeton berchtoldii)
Potamogeton richardsonii
Potamogeton robbinsii
Potamogeton zosteriformis
Potentilla anglica
Potentilla anserina
Potentilla anserina subsp. anserina
Potentilla anserina subsp. pacifica
Potentilla basaltica
Potentilla biennis
Potentilla breweri
Potentilla bruceae
Potentilla concinna var. proxima
Potentilla cristae
Potentilla diversifolia var. diversifolia* (under Potentilla glaucophylla var. glaucophylla)
Potentilla diversifolia* (under Potentilla glaucophylla var. glaucophylla)
Potentilla drummondii
Potentilla drummondii subsp. breweri* (under Potentilla breweri)
Potentilla drummondii subsp. bruceae* (under Potentilla bruceae)
Potentilla flabellifolia
Potentilla fruticosa* (under Dasiphora fruticosa)
Potentilla glandulosa subsp. ashlandica* (under Drymocallis lactea var. austiniae)
Potentilla glandulosa subsp. ewanii* (under Drymocallis cuneifolia var. ewanii)
Potentilla glandulosa subsp. glandulosa* (under Drymocallis glandulosa var. glandulosa)
Potentilla glandulosa subsp. globosa* (under Drymocallis rhomboidea)
Potentilla glandulosa subsp. hansenii* (under Drymocallis hansenii)
Potentilla glandulosa subsp. nevadensis* (under Drymocallis lactea var. lactea)
Potentilla glandulosa subsp. pseudorupestris* (under Drymocallis pseudorupestris)
Potentilla glandulosa subsp. reflexa* (under Drymocallis glandulosa var. reflexa)
Potentilla glandulosa* (under Drymocallis glandulosa)
Potentilla glaucophylla var. glaucophylla
Potentilla gracilis
Potentilla gracilis var. elmeri
Potentilla gracilis var. fastigiata
Potentilla gracilis var. flabelliformis
Potentilla gracilis var. gracilis
Potentilla grayi
Potentilla hickmanii
Potentilla jepsonii
Potentilla millefolia
Potentilla morefieldii
Potentilla multijuga
Potentilla newberryi
Potentilla norvegica
Potentilla palustris* (under Comarum palustre)
Potentilla peirsonii* (under Drymocallis cuneifolia var. cuneifolia)
Potentilla pensylvanica
Potentilla pseudosericea
Potentilla pulcherrima
Potentilla recta
Potentilla rimicola
Potentilla rivalis
Potentilla uliginosa
Potentilla wheeleri
Poteridium annuum
Poterium sanguisorba
Prenanthella exigua
Primula clevelandii
Primula clevelandii var. clevelandii
Primula clevelandii var. gracilis
Primula clevelandii var. insularis
Primula clevelandii var. patula
Primula conjugens
Primula fragrans
Primula hendersonii
Primula jeffreyi
Primula pauciflora
Primula pauciflora var. monantha* (under Primula pauciflora)
Primula pauciflora var. shoshonensis* (under Primula pauciflora)
Primula subalpina
Primula suffrutescens
Primula tetrandra
Prionopsis ciliata* (under Grindelia)
Proboscidea althaeifolia
Proboscidea louisianica subsp. louisianica
Proboscidea lutea
Prosartes hookeri
Prosartes parvifolia
Prosartes smithii
Prosopis glandulosa var. torreyana
Prosopis pubescens
Prosopis strombulifera
Prosopis velutina
Prunella vulgaris
Prunella vulgaris subsp. lanceolata* (under Prunella vulgaris var. lanceolata)
Prunella vulgaris var. atropurpurea* (under Prunella vulgaris var. lanceolata)
Prunella vulgaris var. lanceolata
Prunella vulgaris var. parviflora* (under Prunella vulgaris var. vulgaris)
Prunella vulgaris var. vulgaris
Prunus amygdalus* (under Prunus dulcis)
Prunus andersonii
Prunus cerasifera
Prunus dulcis
Prunus emarginata
Prunus eremophila
Prunus fasciculata
Prunus fasciculata var. fasciculata
Prunus fasciculata var. punctata
Prunus fremontii
Prunus ilicifolia
Prunus ilicifolia subsp. ilicifolia
Prunus ilicifolia subsp. lyonii
Prunus persica
Prunus subcordata
Prunus virginiana var. demissa
Psathyrotes annua
Psathyrotes ramosissima
Pseudelymus saxicola* (under Elymus spicatus)
Pseudobahia bahiifolia
Pseudobahia heermannii
Pseudobahia peirsonii
Pseudognaphalium beneolens
Pseudognaphalium biolettii
Pseudognaphalium californicum
Pseudognaphalium canescens
Pseudognaphalium leucocephalum
Pseudognaphalium luteoalbum
Pseudognaphalium macounii
Pseudognaphalium microcephalum
Pseudognaphalium microcephalum var. thermale* (under Pseudognaphalium thermale)
Pseudognaphalium ramosissimum
Pseudognaphalium roseum
Pseudognaphalium stramineum
Pseudognaphalium thermale
Pseudoroegneria spicata* (under Elymus spicatus)
Pseudorontium cyathiferum
Pseudostellaria jamesiana
Pseudostellaria sierrae
Pseudotrillium rivale
Pseudotsuga macrocarpa
Pseudotsuga menziesii var. menziesii
Psilocarphus brevissimus
Psilocarphus brevissimus var. brevissimus
Psilocarphus brevissimus var. multiflorus
Psilocarphus chilensis
Psilocarphus elatior
Psilocarphus globiferus* (under Psilocarphus brevissimus var. brevissimus) (under Psilocarphus chilensis)
Psilocarphus oregonus
Psilocarphus tenellus
Psilocarphus tenellus var. globiferus* (under Psilocarphus chilensis)
Psilocarphus tenellus var. tenuis* (under Psilocarphus chilensis)
Psilostrophe cooperi
Psoralea bituminosa* (under Bituminaria bituminosa)
Psoralea physodes* (under Rupertia physodes)
Psoralidium lanceolatum* (under Ladeania lanceolata)
Psorothamnus arborescens
Psorothamnus arborescens var. arborescens
Psorothamnus arborescens var. minutifolius
Psorothamnus arborescens var. simplicifolius
Psorothamnus emoryi
Psorothamnus fremontii
Psorothamnus fremontii var. attenuatus
Psorothamnus fremontii var. fremontii
Psorothamnus polydenius
Psorothamnus schottii
Psorothamnus spinosus
Ptelea crenulata
Pteridium aquilinum var. pubescens
Pteris cretica
Pteris tremula
Pteris vittata
Pterocarya stenoptera
Pterospora andromedea
Pterostegia drymarioides
Pteryxia petraea* (under Cymopterus terebinthinus var. petraeus)
Pteryxia terebinthina var. californica* (under Cymopterus terebinthinus var. californicus)
Ptilagrostis kingii* (under Stipa kingii)
Puccinellia airoides* (under Puccinellia nuttalliana)
Puccinellia californica* (under Torreyochloa pallida var. pauciflora)
Puccinellia distans
Puccinellia erecta* (under Torreyochloa erecta)
Puccinellia grandis* (under Puccinellia nutkaensis)
Puccinellia howellii
Puccinellia lemmonii
Puccinellia nutkaensis
Puccinellia nuttalliana
Puccinellia parishii
Puccinellia pauciflora* (under Torreyochloa pallida var. pauciflora)
Puccinellia pumila
Puccinellia simplex
Pulicaria paludosa
Punica granatum
Purshia mexicana var. stansburyana* (under Purshia stansburyana)
Purshia stansburyana
Purshia tridentata
Purshia tridentata var. glandulosa
Purshia tridentata var. tridentata
Pycnanthemum californicum
Pyracantha angustifolia
Pyracantha atalantioides
Pyracantha coccinea
Pyracantha crenulata
Pyracantha fortuneana
Pyracantha koidzumii
Pyrola asarifolia
Pyrola asarifolia subsp. asarifolia
Pyrola asarifolia subsp. bracteata
Pyrola chlorantha
Pyrola minor
Pyrola picta
Pyrrocoma apargioides
Pyrrocoma carthamoides var. cusickii
Pyrrocoma hirta
Pyrrocoma hirta var. hirta
Pyrrocoma hirta var. lanulosa
Pyrrocoma lanceolata
Pyrrocoma lanceolata var. lanceolata
Pyrrocoma lanceolata var. subviscosa
Pyrrocoma lucida
Pyrrocoma racemosa
Pyrrocoma racemosa var. congesta
Pyrrocoma racemosa var. paniculata
Pyrrocoma racemosa var. pinetorum
Pyrrocoma racemosa var. racemosa
Pyrrocoma racemosa var. sessiliflora
Pyrrocoma uniflora
Pyrrocoma uniflora var. gossypina
Pyrrocoma uniflora var. uniflora
Pyrus communis
Pyrus malus* (under Malus pumila)

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