| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| PRVIM | Prunus virginiana L. var. melanocarpa (A. Nels.) Sarg. | black chokecherry | Rosaceae
|
| PRVIV | Prunus virginiana L. var. virginiana | chokecherry | Rosaceae
|
| PRVI | Prunus virginiana L. | chokecherry | Rosaceae
|
| PRUNU | Prunus L. | plum | Rosaceae
|
| PSDE2 | Psacalium decompositum (Gray) H.E. Robins. & Brett. | desert Indianbush | Asteraceae
|
| PSACA | Psacalium Cass. | Indianbush | Asteraceae
|
| PSMU | Psammophiliella muralis (L.) S. Ikonnikov | Gypsophila muralis | Caryophyllaceae
|
| PSJU3 | Psathyrostachys juncea (Fisch.) Nevski | Russian wildrye | Poaceae
|
| PSATH2 | Psathyrostachys Nevski | wildrye | Poaceae
|
| PSAN | Psathyrotes annua (Nutt.) Gray | annual psathyrotes | Asteraceae
|
| PSPI | Psathyrotes pilifera Gray | hairybeast turtleback | Asteraceae
|
| PSRA | Psathyrotes ramosissima (Torr.) Gray | velvet turtleback | Asteraceae
|
| PSSC | Psathyrotes scaposa Gray | naked turtleback | Asteraceae
|
| PSATH | Psathyrotes Gray | turtleback | Asteraceae
|
| PSHE3 | Psedera heptaphylla (Buckl.) Rehd. | Parthenocissus heptaphylla | Vitaceae
|
| PSQUM | Psedera quinquefolia (L.) Greene var. murorum (Focke) Rehd. | Parthenocissus quinquefolia | Vitaceae
|
| PSQU | Psedera quinquefolia (L.) Greene | Parthenocissus quinquefolia | Vitaceae
|
| PSLO5 | Pseudabutilon lozanii (Rose) R.E. Fries | Allowissadula lozanii | Malvaceae
|
| PSST8 | Pseudabutilon stuckertii R.E. Fries | velvetleaf Indian mallow | Malvaceae
|
| PSUM2 | Pseudabutilon umbellatum (L.) Fryxell | umbrella Indian mallow | Malvaceae
|
| PSEUD44 | Pseudabutilon R.E. Fries | pseudabutilon | Malvaceae
|
| PSUM | Pseudanamomis umbellulifera (Kunth) Kausel | ciruelas | Myrtaceae
|
| PSEUD12 | Pseudanamomis Kausel | pseudanamomis | Myrtaceae
|
| PSSP4 | Pseudelephantopus spicatus (Juss. ex Aubl.) C.F. Baker | dog's-tongue | Asteraceae
|
| PSSP7 | Pseudelephantopus spirilis (Less.) Cronq. | spiral dog's-tongue | Asteraceae
|
| PSEUD17 | Pseudelephantopus Rohr | dog's-tongue | Asteraceae
|
| PSSA2 | �Pseudelymus saxicola (Scribn. & J.G. Sm.) Barkworth & D.R. Dewey | foxtail wheatgrass | Poaceae
|
| PSEUD23 | �Pseudelymus Barkworth & D.R. Dewey | foxtail wheatgrass | Poaceae
|
| PSMI60 | Pseudephebe minuscula (Nyl. ex Arnold) Brodo & D. Hawksw. | blackcurly lichen | Parmeliaceae
|
| PSPU60 | Pseudephebe pubescens (L.) Choisy | blackcurly lichen | Parmeliaceae
|
| PSEUD33 | Pseudephebe Choisy | blackcurly lichen | Parmeliaceae
|
| PSNI4 | Pseudephemerum nitidum (Hedw.) Loeske | pseudephemerum moss | Dicranaceae
|
| PSEUD26 | Pseudephemerum (Lindb.) Loeske | pseudephemerum moss | Dicranaceae
|
| PSCA16 | Pseuderanthemum carruthersii (Seem.) Guillaumin | | Acanthaceae
|
| PSFA2 | Pseuderanthemum fasciculatum auct. non (Oerst.) Leonard | Pseuderanthemum praecox | Acanthaceae
|
| PSPR | Pseuderanthemum praecox (Benth.) Leonard | night and afternoon | Acanthaceae
|
| PSEUD21 | Pseuderanthemum Radlk. | pseuderanthemum | Acanthaceae
|
| PSCL | Pseudevernia cladonia (Tuck.) Hale & Culb. | cladonia light and dark lichen | Parmeliaceae
|
| PSCO9 | Pseudevernia consocians (Vainio) Hale & Culb. | light and dark lichen | Parmeliaceae
|
| PSFU | Pseudevernia furfuracea (L.) Zopf | Pseudevernia intensa | Parmeliaceae
|
| PSIN5 | Pseudevernia intensa (Nyl.) Hale & Culb. | intense light and dark lichen | Parmeliaceae
|
| PSEUD34 | Pseudevernia Zopf | light and dark lichen | Parmeliaceae
|
| PSMYF | Pseudisothecium myosuroides (Brid.) Grout var. filescens (Ren.) Grout | Isothecium myosuroides | Brachytheciaceae
|
| PSMY | Pseudisothecium myosuroides (Brid.) Grout | Isothecium myosuroides | Brachytheciaceae
|
| PSSTC | Pseudisothecium stoloniferum (Brid.) Grout var. cardotii (Kindb. in Mac. & Kindb.) Grout | Isothecium myosuroides | Brachytheciaceae
|
| PSSTM | Pseudisothecium stoloniferum (Brid.) Grout var. myurellum (Kindb.) Grout | Isothecium myosuroides | Brachytheciaceae
|
| PSST6 | Pseudisothecium stoloniferum (Brid.) Grout | Isothecium myosuroides | Brachytheciaceae
|
| PSBAP | Pseudobahia bahiifolia (Benth.) Rydb. var. pinnatifida Gray | Pseudobahia heermannii | Asteraceae
|
| PSBA | Pseudobahia bahiifolia (Benth.) Rydb. | Hartweg's golden sunburst | Asteraceae
|
| PSHE | Pseudobahia heermannii (Dur.) Rydb. | foothill sunburst | Asteraceae
|
| PSPE | Pseudobahia peirsonii Munz | San Joaquin adobe sunburst | Asteraceae
|
| PSEUD2 | Pseudobahia Rydb. | sunburst | Asteraceae
|
| PSCA9 | Pseudobraunia californica (Lesq.) Broth. | California pseudobraunia moss | Hedwigiaceae
|
| PSEUD27 | Pseudobraunia (Lesq. & James) Broth. | pseudobraunia moss | Hedwigiaceae
|
| PSCI2 | Pseudobryum cinclidioides (H�b.) T. Kop. | pseudobryum moss | Mniaceae
|
| PSEUD28 | Pseudobryum (Kindb.) T. Kop. | pseudobryum moss | Mniaceae
|
| PSTU70 | Pseudocalliergon turgescens (T. Jens.) Loeske | pseudocalliergon moss | Amblystegiaceae
|
| PSEUD38 | Pseudocalliergon (Limpr.) Loeske | pseudocalliergon moss | Amblystegiaceae
|
| PSAR | Pseudoclappia arenaria Rydb. | TransPecos false clapdaisy | Asteraceae
|
| PSWA3 | Pseudoclappia watsonii Powell & B.L. Turner | Watson's false clapdaisy | Asteraceae
|
| PSEUD3 | Pseudoclappia Rydb. | false clapdaisy | Asteraceae
|
| PSAU2 | Pseudocrossidium aureum (Bartr.) Zand. | pseudocrossidium moss | Pottiaceae
|
| PSHO3 | Pseudocrossidium hornschuchianum (Schultz) Zand. | Hornschuch's pseudocrossidium moss | Pottiaceae
|
| PSOB2 | Pseudocrossidium obtusulum (Lindb.) Crum & Anderson | pseudocrossidium moss | Pottiaceae
|
| PSRE3 | Pseudocrossidium replicatum (Tayl.) Zand. | pseudocrossidium moss | Pottiaceae
|
| PSREO | Pseudocrossidium revolutum (Brid. in Schrad.) Zand. var. obtusulum (Lindb.) Tan et al. | Pseudocrossidium obtusulum | Pottiaceae
|
| PSRE4 | Pseudocrossidium revolutum (Brid. in Schrad.) Zand. | pseudocrossidium moss | Pottiaceae
|
| PSEUD29 | Pseudocrossidium Williams | pseudocrossidium moss | Pottiaceae
|
| PSDO3 | Pseudocryphaea domingensis (Spreng.) Buck | Domingan pseudocryphaea moss | Leucodontaceae
|
| PSFL2 | Pseudocryphaea flagellifera (Brid.) Britt. in Broth. | Pseudocryphaea domingensis | Leucodontaceae
|
| PSEUD39 | Pseudocryphaea Britt. ex Broth. | pseudocryphaea moss | Leucodontaceae
|
| PSSI4 | Pseudocydonia sinensis (Dum.-Cours.) Schneid. | Chinese-quince | Rosaceae
|
| PSEUD45 | Pseudocydonia Schneid. | Chinese-quince | Rosaceae
|
| PSLO3 | Pseudocymopterus longiradiatus Mathias, Constance & Theobald | TransPecos false mountainparsley | Apiaceae
|
| PSMO | Pseudocymopterus montanus (Gray) Coult. & Rose | alpine false springparsley | Apiaceae
|
| PSTI | Pseudocymopterus tidestromii Coult. & Rose | Pseudocymopterus montanus | Apiaceae
|
| PSEUD4 | Pseudocymopterus Coult. & Rose | false springparsley | Apiaceae
|
| PSAN60 | Pseudocyphellaria anomala Brodo & Ahti | | Lobariaceae
|
| PSAN61 | Pseudocyphellaria anthraspis (Ach.) H. Magn. | | Lobariaceae
|
| PSAU | Pseudocyphellaria aurata (Ach.) Vainio | | Lobariaceae
|
| PSCR60 | Pseudocyphellaria crocata (L.) Vainio | | Lobariaceae
|
| PSMO6 | Pseudocyphellaria mougeotiana (Delise) Vainio | Pseudocyphellaria crocata | Lobariaceae
|
| PSPE6 | Pseudocyphellaria perpetua McCune & Miadlikowska | | Lobariaceae
|
| PSRA3 | Pseudocyphellaria rainierensis Imshaug | | Lobariaceae
|
| PSEUD35 | Pseudocyphellaria Vainio | pseudocyphellaria | Lobariaceae
|
| PSMI3 | Pseudoditrichum mirabile Steere & Iwats. | pseudodotrichum moss | Pseudoditrichaceae
|
| PSEUD30 | Pseudoditrichum Steere & Iwats. | pseudoditrichum moss | Pseudoditrichaceae
|
| PSLU2 | Pseudofumaria lutea (L.) Borkh. | rock fumewort | Fumariaceae
|
| PSEUD16 | Pseudofumaria Medik. | pseudofumaria | Fumariaceae
|
| PSAR12 | Pseudognaphalium arizonicum (Gray) A. Anderb. | Arizona cudweed | Asteraceae
|
| PSAT5 | Pseudognaphalium attenuatum (DC.) A. Anderb. | tapered cudweed | Asteraceae
|
| PSBI2 | Pseudognaphalium bicolor (Bioletti) A. Anderb. | twocolor cudweed | Asteraceae
|
| PSCA13 | Pseudognaphalium californicum (DC.) A. Anderb. | ladies' tobacco | Asteraceae
|
| PSCAB | Pseudognaphalium canescens (DC.) W.A. Weber ssp. beneolens (A. Davids.) Kartesz, comb. nov. ined. | Wright's cudweed | Asteraceae
|
| PSCAC2 | Pseudognaphalium canescens (DC.) W.A. Weber ssp. canescens | Wright's cudweed | Asteraceae
|
| PSCAM | Pseudognaphalium canescens (DC.) W.A. Weber ssp. microcephalum (Nutt.) Kartesz, comb. nov. ined. | Wright's cudweed | Asteraceae
|
| PSCAT | Pseudognaphalium canescens (DC.) W.A. Weber ssp. thermale (E. Nels.) Kartesz, comb. nov. ined. | Wright's cudweed | Asteraceae
|
| PSCA11 | Pseudognaphalium canescens (DC.) W.A. Weber | Wright's cudweed | Asteraceae
|
| PSDO4 | Pseudognaphalium domingense (Lam.) A. Anderb. | Dominican cudweed | Asteraceae
|
| PSEL4 | Pseudognaphalium elegans (Kunth) Kartesz, comb. nov. ined. | royal cudweed | Asteraceae
|
| PSHEH7 | Pseudognaphalium helleri (Britt.) A. Anderb. ssp. helleri | Heller's cudweed | Asteraceae
|