| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| PSOCC | Psilochenia occidentalis (Nutt.) Nutt. ssp. conjuncta (Jepson) W.A. Weber | Crepis occidentalis ssp. conjuncta | Asteraceae
|
| PSOCC2 | Psilochenia occidentalis (Nutt.) Nutt. ssp. costata (Gray) W.A. Weber | Crepis occidentalis ssp. costata | Asteraceae
|
| PSOC | Psilochenia occidentalis (Nutt.) Nutt. | Crepis occidentalis ssp. occidentalis | Asteraceae
|
| PSPL | Psilochenia pleurocarpa (Gray) W.A. Weber | Crepis pleurocarpa | Asteraceae
|
| PSRUA | Psilochenia runcinata (James) A.& D. L�ve ssp. andersonii (Gray) W.A. Weber | Crepis runcinata ssp. andersonii | Asteraceae
|
| PSRUB | Psilochenia runcinata (James) A.& D. L�ve ssp. barberi (Greenm.) W.A. Weber | Crepis runcinata ssp. barberi | Asteraceae
|
| PSRUG | Psilochenia runcinata (James) A.& D. L�ve ssp. glauca (Nutt.) W.A. Weber | Crepis runcinata ssp. glauca | Asteraceae
|
| PSRUH | Psilochenia runcinata (James) A.& D. L�ve ssp. hallii (Babcock & Stebbins) W.A. Weber | Crepis runcinata ssp. hallii | Asteraceae
|
| PSRUH2 | Psilochenia runcinata (James) A.& D. L�ve ssp. hispidulosa (T.J. Howell ex Rydb.) W.A. Weber | Crepis runcinata ssp. hispidulosa | Asteraceae
|
| PSRUI | Psilochenia runcinata (James) A.& D. L�ve ssp. imbricata (Babcock & Stebbins) W.A. Weber | Crepis runcinata ssp. imbricata | Asteraceae
|
| PSRU2 | Psilochenia runcinata (James) A.& D. L�ve | Crepis runcinata ssp. runcinata | Asteraceae
|
| PSMA8 | Psilochilus macrophyllus (Lindl.) Ames | raggedlip orchid | Orchidaceae
|
| PSILO5 | Psilochilus Barb. Rodr. | psilochilus | Orchidaceae
|
| PSHI | Psilogramme hispidulus (Kunze) Kuhn | Eriosorus hispidulus | Pteridaceae
|
| PSPO2 | Psilogramme portoricensis Maxon | Eriosorus hispidulus | Pteridaceae
|
| PSCL2 | Psilolechia clavulifera (Nyl.) Coppins | | Micareaceae
|
| PSLU3 | Psilolechia lucida (Ach.) Choisy | | Micareaceae
|
| PSILO7 | Psilolechia A. Massal. | psilolechia | Micareaceae
|
| PSAR10 | Psilopilum arcticum Brid. | Psilopilum laevigatum | Polytrichaceae
|
| PSCA10 | Psilopilum cavifolium (Wils.) Hag. | psilopilum moss | Polytrichaceae
|
| PSFA4 | Psilopilum falcatum (Steere) Crum et al. | Oligotrichum falcatum | Polytrichaceae
|
| PSLA5 | Psilopilum laevigatum (Wahlenb.) Lindb. | psilopilum moss | Polytrichaceae
|
| PSILO6 | Psilopilum Brid. | psilopilum moss | Polytrichaceae
|
| PSBA2 | Psilostrophe bakeri Greene | Baker's paperflower | Asteraceae
|
| PSCO2 | Psilostrophe cooperi (Gray) Greene | whitestem paperflower | Asteraceae
|
| PSGN | Psilostrophe gnaphalioides DC. | dudweed | Asteraceae
|
| PSSP | Psilostrophe sparsiflora (Gray) A. Nels. | greenstem paperflower | Asteraceae
|
| PSTAC | Psilostrophe tagetina (Nutt.) Greene var. cerifera (A. Nels.) B.L. Turner | woolly paperflower | Asteraceae
|
| PSTAG | Psilostrophe tagetina (Nutt.) Greene var. grandiflora (Rydb.) Heiser | Psilostrophe tagetina var. tagetina | Asteraceae
|
| PSTAL | Psilostrophe tagetina (Nutt.) Greene var. lanata A. Nels. | Psilostrophe tagetina var. tagetina | Asteraceae
|
| PSTAT | Psilostrophe tagetina (Nutt.) Greene var. tagetina | woolly paperflower | Asteraceae
|
| PSTA | Psilostrophe tagetina (Nutt.) Greene | woolly paperflower | Asteraceae
|
| PSVI | Psilostrophe villosa Rydb. | Psilostrophe tagetina var. cerifera | Asteraceae
|
| PSILO3 | Psilostrophe DC. | paperflower | Asteraceae
|
| PSCO3 | Psilotum complanatum Sw. | flatfork fern | Psilotaceae
|
| PSIN7 | Psilotum �intermedium W.H. Wagner | | Psilotaceae
|
| PSNU | Psilotum nudum (L.) Beauv. | whisk fern | Psilotaceae
|
| PSILO4 | Psilotum Sw. | whisk fern | Psilotaceae
|
| PSPA5 | Psophocarpus palmettorum Guillemin, Perrottet, & A. Rich. | Psophocarpus palustris | Fabaceae
|
| PSPA4 | Psophocarpus palustris Desv. | psophocarpus | Fabaceae
|
| PSTE10 | Psophocarpus tetragonolobus (L.) DC. | winged bean | Fabaceae
|
| PSOPH2 | Psophocarpus Necker ex DC. | psophocarpus | Fabaceae
|
| PSAN2 | Psora anthracophila (Nyl.) Arnold | Biatora anthracophila | Bacidiaceae
|
| PSCA6 | Psora californica Timdal | California fishscale lichen | Psoraceae
|
| PSCE | Psora cerebriformis W. A. Weber | cerebral fishscale lichen | Psoraceae
|
| PSCR2 | Psora crenata (Taylor) Reinke | crenate fishscale lichen | Psoraceae
|
| PSDE60 | Psora decipiens (Hedwig) Hoffm. | fishscale lichen | Psoraceae
|
| PSDE3 | Psora demissa (Rutstr.) Hepp | Lecidoma demissum | Psoraceae
|
| PSFR2 | Psora friesii (Ach.) Hellbom | Hypocenomyce friesii | Lecideaceae
|
| PSGL2 | Psora globifera (Ach.) A. Massal. | globe fishscale lichen | Psoraceae
|
| PSHI2 | Psora himalayana (Church. Bab.) Timdal | Himalaya fishscale lichen | Psoraceae
|
| PSIC | Psora icterica (Mont.) Mull. Arg. | fishscale lichen | Psoraceae
|
| PSLU5 | Psora lurida (Ach.) DC. | Lecidea lurida | Lecideaceae
|
| PSLU4 | Psora luridella (Tuck.) Fink | lurid fishscale lichen | Psoraceae
|
| PSMO7 | Psora montana Timdal | mountain fishscale lichen | Psoraceae
|
| PSNI2 | Psora nipponica (Zahlbr.) Gotth. Schneider | Japanese fishscale lichen | Psoraceae
|
| PSNO | Psora novomexicana de Lesd. | Psora nipponica | Psoraceae
|
| PSOS | Psora ostreata Hoffm. | Hypocenomyce scalaris | Lecideaceae
|
| PSPA3 | Psora pacifica Timdal | Pacific fishscale lichen | Psoraceae
|
| PSPE5 | Psora petri (Tuck.) Fink | Lecidea lurida | Lecideaceae
|
| PSPS3 | Psora pseudorussellii Timdal | false Russell's fishscale lichen | Psoraceae
|
| PSRU60 | Psora rubiformis (Ach.) Hook. | fishscale lichen | Psoraceae
|
| PSRU6 | Psora rufonigra (Tuck.) A. Schneider | Psorula rufonigra | Psoraceae
|
| PSRU3 | Psora russellii (Tuck.) A. Schneider | Russell's fishscale lichen | Psoraceae
|
| PSSC10 | Psora scalaris (Ach. ex Lilj.) Hook. | Hypocenomyce scalaris | Lecideaceae
|
| PSSC11 | Psora scholanderi (Lynge) R. Anderson | Toninia tristis | Catillariaceae
|
| PSTE7 | Psora tenuifolia Timdal | fishscale lichen | Psoraceae
|
| PSTE9 | Psora texana W. A. Weber | Xanthopsorella texana | Catillariaceae
|
| PSTU | Psora tuckermanii R. Anderson ex Timdal | Tuckerman's fishscale lichen | Psoraceae
|
| PSVA | Psora vallesiaca (Schaerer) Timdal | fishscale lichen | Psoraceae
|
| PSORA3 | Psora Hoffm. | fishscale lichen | Psoraceae
|
| PSAM2 | Psoralea americana L. | Cullen americana | Fabaceae
|
| PSAR2 | Psoralea argophylla Pursh | Pediomelum argophyllum | Fabaceae
|
| PSAR3 | Psoralea aromatica Payson | Pediomelum aromaticum | Fabaceae
|
| PSBI | Psoralea bituminosa L. | Bituminaria bituminosa | Fabaceae
|
| PSBR6 | Psoralea brachypus (Rydb.) Standl. | Pediomelum rhombifolium | Fabaceae
|
| PSCA2 | Psoralea californica S. Wats. | Pediomelum californicum | Fabaceae
|
| PSCA3 | Psoralea canescens Michx. | Pediomelum canescens | Fabaceae
|
| PSCA4 | Psoralea castorea S. Wats. | Pediomelum castoreum | Fabaceae
|
| PSCO5 | Psoralea collina Rydb. | Pediomelum argophyllum | Fabaceae
|
| PSCO6 | Psoralea corylifolia L. | Cullen corylifolia | Fabaceae
|
| PSCU | Psoralea cuspidata Pursh | Pediomelum cuspidatum | Fabaceae
|
| PSCY | Psoralea cyphocalyx Gray | Pediomelum cyphocalyx | Fabaceae
|
| PSDIP | Psoralea digitata Nutt. ex Torr. & Gray var. parvifolia Shinners | Pediomelum digitatum | Fabaceae
|
| PSDI | Psoralea digitata Nutt. ex Torr. & Gray | Pediomelum digitatum | Fabaceae
|
| PSDOH | Psoralea douglasii Greene var. hansenii Jepson | Hoita macrostachya | Fabaceae
|
| PSDO | Psoralea douglasii Greene | Hoita macrostachya | Fabaceae
|
| PSEP | Psoralea epipsila Barneby | Pediomelum megalanthum var. epipsilum | Fabaceae
|
| PSES | Psoralea esculenta Pursh | Pediomelum esculentum | Fabaceae
|
| PSFL | Psoralea floribunda Nutt. ex Torr. & Gray | Psoralidium tenuiflorum | Fabaceae
|
| PSHAM2 | Psoralea hallii (Rydb.) Jepson var. media Jepson | Hoita macrostachya | Fabaceae
|
| PSHA | Psoralea hallii (Rydb.) Jepson | Rupertia hallii | Fabaceae
|
| PSHU | Psoralea humilis (Rydb.) J.F. Macbr. | Pediomelum humile | Fabaceae
|
| PSHYS2 | Psoralea hypogaea Nutt. ex Torr. & Gray ssp. scaposa (Gray) D.J. Ockendon | Pediomelum hypogaeum var. scaposum | Fabaceae
|
| PSHYS | Psoralea hypogaea Nutt. ex Torr. & Gray var. scaposa Gray | Pediomelum hypogaeum var. scaposum | Fabaceae
|
| PSHY | Psoralea hypogaea Nutt. ex Torr. & Gray | Pediomelum hypogaeum var. hypogaeum | Fabaceae
|
| PSJU | Psoralea juncea Eastw. | Psoralidium junceum | Fabaceae
|
| PSLAS3 | Psoralea lanceolata Pursh ssp. scabra (Nutt.) Piper | Psoralidium lanceolatum | Fabaceae
|
| PSLAP2 | Psoralea lanceolata Pursh var. purshii (Vail) Piper | Psoralidium lanceolatum | Fabaceae
|
| PSLAS | Psoralea lanceolata Pursh var. stenophylla (Rydb.) Toft & Welsh | Psoralidium lanceolatum | Fabaceae
|
| PSLAS2 | Psoralea lanceolata Pursh var. stenostachys (Rydb.) Welsh | Psoralidium lanceolatum | Fabaceae
|