| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| PECEE | Pedicularis centranthera Gray var. exulans M.E. Peck | Pedicularis centranthera | Scrophulariaceae
|
| PECE | Pedicularis centranthera Gray | dwarf lousewort | Scrophulariaceae
|
| PECH | Pedicularis chamissonis Stev. | Chamisso's lousewort | Scrophulariaceae
|
| PECO31 | Pedicularis concinna Eastw. | Pedicularis attollens ssp. attollens | Scrophulariaceae
|
| PECOC2 | Pedicularis contorta Benth. var. contorta | coiled lousewort | Scrophulariaceae
|
| PECOC | Pedicularis contorta Benth. var. ctenophora (Rydb.) A. Nels. & J.F. Macbr. | coiled lousewort | Scrophulariaceae
|
| PECOR | Pedicularis contorta Benth. var. rubicunda N. Reese | coiled lousewort | Scrophulariaceae
|
| PECO | Pedicularis contorta Benth. | coiled lousewort | Scrophulariaceae
|
| PECR | Pedicularis crenulata Benth. | meadow lousewort | Scrophulariaceae
|
| PECT | Pedicularis ctenophora Rydb. | Pedicularis contorta var. ctenophora | Scrophulariaceae
|
| PECY5 | Pedicularis cystopteridifolia Rydb. | fernleaved pedicularis | Scrophulariaceae
|
| PEDEA | Pedicularis densiflora Benth. ex Hook. ssp. aurantiaca E. Sprague | Indian warrior | Scrophulariaceae
|
| PEDED | Pedicularis densiflora Benth. ex Hook. ssp. densiflora | Indian warrior | Scrophulariaceae
|
| PEDE | Pedicularis densiflora Benth. ex Hook. | Indian warrior | Scrophulariaceae
|
| PEDU | Pedicularis dudleyi Elmer | Dudley's lousewort | Scrophulariaceae
|
| PEEL7 | Pedicularis elata Pursh | Pedicularis cystopteridifolia | Scrophulariaceae
|
| PEEU2 | Pedicularis euphrasioides Steph. ex Willd. | Pedicularis labradorica | Scrophulariaceae
|
| PEFL10 | Pedicularis flavida Pennell | Pedicularis bracteosa var. flavida | Scrophulariaceae
|
| PEFL11 | Pedicularis fluviatilis Heller | Pedicularis canadensis ssp. fluviatilis | Scrophulariaceae
|
| PEFU | Pedicularis furbishiae S. Wats. | St. Johns River lousewort | Scrophulariaceae
|
| PEGL13 | Pedicularis gladiata Michx. | Pedicularis canadensis ssp. canadensis | Scrophulariaceae
|
| PEGR | Pedicularis grayi A. Nels. | Pedicularis procera | Scrophulariaceae
|
| PEGRS2 | Pedicularis groenlandica Retz. ssp. surrecta (Benth.) Piper | Pedicularis groenlandica | Scrophulariaceae
|
| PEGRS3 | Pedicularis groenlandica Retz. var. surrecta (Benth.) Gray | Pedicularis groenlandica | Scrophulariaceae
|
| PEGR2 | Pedicularis groenlandica Retz. | elephanthead lousewort | Scrophulariaceae
|
| PEHA16 | Pedicularis hallii Rydb. | Pedicularis parryi ssp. purpurea | Scrophulariaceae
|
| PEHI5 | Pedicularis hians Eastw. | Pedicularis langsdorfii ssp. arctica | Scrophulariaceae
|
| PEHI4 | Pedicularis hirsuta L. | hairy lousewort | Scrophulariaceae
|
| PEHO | Pedicularis howellii Gray | Howell's lousewort | Scrophulariaceae
|
| PEKA7 | Pedicularis kanei Dur. | woolly lousewort | Scrophulariaceae
|
| PELA | Pedicularis labradorica Wirsing | Labrador lousewort | Scrophulariaceae
|
| PELA14 | Pedicularis lanata Cham. & Schlecht. | Pedicularis kanei | Scrophulariaceae
|
| PELA2 | Pedicularis lanceolata Michx. | swamp lousewort | Scrophulariaceae
|
| PELAA2 | Pedicularis langsdorfii Fisch. ex Stev. ssp. arctica (R. Br.) Pennell | arctic lousewort | Scrophulariaceae
|
| PELAL5 | Pedicularis langsdorfii Fisch. ex Stev. ssp. langsdorfii | Langsdorf's lousewort | Scrophulariaceae
|
| PELAA3 | Pedicularis langsdorfii Fisch. ex Stev. var. arctica (R. Br.) Polunin | Pedicularis langsdorfii ssp. arctica | Scrophulariaceae
|
| PELA3 | Pedicularis langsdorfii Fisch. ex Stev. | Langsdorf's lousewort | Scrophulariaceae
|
| PELA4 | Pedicularis lapponica L. | Lapland lousewort | Scrophulariaceae
|
| PELA21 | Pedicularis latifolia Pennell | Pedicularis bracteosa var. latifolia | Scrophulariaceae
|
| PELU4 | Pedicularis lunata Rydb. | Pedicularis contorta var. ctenophora | Scrophulariaceae
|
| PEMA | Pedicularis macrodonta Richards. | muskeg lousewort | Scrophulariaceae
|
| PEME11 | Pedicularis melampyroides L.C. Rich. | Alectra fluminensis | Scrophulariaceae
|
| PEMO12 | Pedicularis mogollonica Greene | Pedicularis parryi ssp. mogollonica | Scrophulariaceae
|
| PEMO10 | Pedicularis montanensis Rydb. | Pedicularis bracteosa var. bracteosa | Scrophulariaceae
|
| PENE9 | Pedicularis nelsonii R. Br. | Pedicularis capitata | Scrophulariaceae
|
| PEOE | Pedicularis oederi Vahl ex Hornem. | Oeder's lousewort | Scrophulariaceae
|
| PEOR | Pedicularis ornithorhyncha Benth. | ducksbill lousewort | Scrophulariaceae
|
| PEPA45 | Pedicularis pachyrhiza Pennell | Pedicularis bracteosa var. pachyrhiza | Scrophulariaceae
|
| PEPA33 | Pedicularis pacifica (Hult�n) Kozh. | Pedicularis sudetica ssp. pacifica | Scrophulariaceae
|
| PEPA44 | Pedicularis paddoensis Pennell | Pedicularis bracteosa var. bracteosa | Scrophulariaceae
|
| PEPA32 | Pedicularis pallida Nutt. | Pedicularis lanceolata | Scrophulariaceae
|
| PEPAM4 | Pedicularis parryi Gray ssp. mogollonica (Greene) G.D. Carr | Mogollon lousewort | Scrophulariaceae
|
| PEPAP4 | Pedicularis parryi Gray ssp. parryi | Parry's lousewort | Scrophulariaceae
|
| PEPAP5 | Pedicularis parryi Gray ssp. purpurea (Parry) G.D. Carr | Rocky Mountain lousewort | Scrophulariaceae
|
| PEPAM | Pedicularis parryi Gray var. mogollonica (Greene) Dorn | Pedicularis parryi ssp. mogollonica | Scrophulariaceae
|
| PEPAP | Pedicularis parryi Gray var. purpurea Parry | Pedicularis parryi ssp. purpurea | Scrophulariaceae
|
| PEPA3 | Pedicularis parryi Gray | Parry's lousewort | Scrophulariaceae
|
| PEPAP6 | Pedicularis parviflora Sm. ex Rees ssp. parviflora | smallflower lousewort | Scrophulariaceae
|
| PEPAP7 | Pedicularis parviflora Sm. ex Rees ssp. pennellii (Hult�n) Hult�n | Pennell's lousewort | Scrophulariaceae
|
| PEPAM2 | Pedicularis parviflora Sm. ex Rees var. macrodonta (Richards.) Welsh | Pedicularis macrodonta | Scrophulariaceae
|
| PEPA4 | Pedicularis parviflora Sm. ex Rees | smallflower lousewort | Scrophulariaceae
|
| PEPA46 | Pedicularis paysoniana Pennell | Pedicularis bracteosa var. paysoniana | Scrophulariaceae
|
| PEPE15 | Pedicularis pedicellata Bunge | Pedicularis ornithorhyncha | Scrophulariaceae
|
| PEPEI | Pedicularis pennellii Hult�n var. insularis (Calder & Taylor) Boivin | Pedicularis parviflora ssp. parviflora | Scrophulariaceae
|
| PEPE9 | Pedicularis pennellii Hult�n | Pedicularis parviflora ssp. pennellii | Scrophulariaceae
|
| PEPR7 | Pedicularis procera Gray | giant lousewort | Scrophulariaceae
|
| PEPU10 | Pedicularis pulchella Pennell | mountain lousewort | Scrophulariaceae
|
| PERAA | Pedicularis racemosa Dougl. ex Benth. ssp. alba Pennell | sickletop lousewort | Scrophulariaceae
|
| PERAR | Pedicularis racemosa Dougl. ex Benth. ssp. racemosa | sickletop lousewort | Scrophulariaceae
|
| PERAA2 | Pedicularis racemosa Dougl. ex Benth. var. alba (Pennell) Cronq. | Pedicularis racemosa ssp. alba | Scrophulariaceae
|
| PERA | Pedicularis racemosa Dougl. ex Benth. | sickletop lousewort | Scrophulariaceae
|
| PERA6 | Pedicularis rainierensis Pennell & Warren | Mt. Rainier lousewort | Scrophulariaceae
|
| PERO9 | Pedicularis romanzovii Cham. ex Spreng. | Pedicularis chamissonis | Scrophulariaceae
|
| PESC9 | Pedicularis scopulorum (Gray) Gray | Pedicularis sudetica ssp. scopulorum | Scrophulariaceae
|
| PESEC2 | Pedicularis semibarbata Gray ssp. charlestonensis (Pennell & Clokey) Clokey | Pedicularis semibarbata var. charlestonensis | Scrophulariaceae
|
| PESEC | Pedicularis semibarbata Gray var. charlestonensis Pennell & Clokey | Charleston lousewort | Scrophulariaceae
|
| PESES | Pedicularis semibarbata Gray var. semibarbata | pinewoods lousewort | Scrophulariaceae
|
| PESE2 | Pedicularis semibarbata Gray | pinewoods lousewort | Scrophulariaceae
|
| PESI5 | Pedicularis siifolia Rydb. | Pedicularis bracteosa var. siifolia | Scrophulariaceae
|
| PESU12 | Pedicularis subnuda Benth. | Pedicularis ornithorhyncha | Scrophulariaceae
|
| PESUA | Pedicularis sudetica Willd. ssp. albolabiata Hult�n | sudetic lousewort | Scrophulariaceae
|
| PESUI | Pedicularis sudetica Willd. ssp. interioides Hult�n | sudetic lousewort | Scrophulariaceae
|
| PESUI2 | Pedicularis sudetica Willd. ssp. interior (Hult�n) Hult�n | sudetic lousewort | Scrophulariaceae
|
| PESUP2 | Pedicularis sudetica Willd. ssp. pacifica Hult�n | Pacific lousewort | Scrophulariaceae
|
| PESUS2 | Pedicularis sudetica Willd. ssp. scopulorum (Gray) Hult�n | sudetic lousewort | Scrophulariaceae
|
| PESUB | Pedicularis sudetica Willd. var. bicolor Walp. | Pedicularis sudetica ssp. albolabiata | Scrophulariaceae
|
| PESUG | Pedicularis sudetica Willd. var. gymnocephala Trautv. | Pedicularis sudetica ssp. interior | Scrophulariaceae
|
| PESUP | Pedicularis sudetica Willd. var. pacifica (Hult�n) Welsh | Pedicularis sudetica ssp. pacifica | Scrophulariaceae
|
| PESUS | Pedicularis sudetica Willd. var. scopulorum Gray | Pedicularis sudetica ssp. scopulorum | Scrophulariaceae
|
| PESU | Pedicularis sudetica Willd. | sudetic lousewort | Scrophulariaceae
|
| PESY | Pedicularis sylvatica L. | lousewort | Scrophulariaceae
|
| PETH7 | Pedicularis thompsonii Pennell | Pedicularis bracteosa var. bracteosa | Scrophulariaceae
|
| PEVE4 | Pedicularis versicolor Wahlenb. | Pedicularis oederi | Scrophulariaceae
|
| PEVE | Pedicularis verticillata L. | whorled lousewort | Scrophulariaceae
|
| PEVI11 | Pedicularis virginica Poir. | Pedicularis lanceolata | Scrophulariaceae
|
| PEWI3 | Pedicularis willdenowii Vved. | Pedicularis kanei | Scrophulariaceae
|
| PEDIC | Pedicularis L. | lousewort | Scrophulariaceae
|
| PEAN13 | Pedilanthus angustifolius Poit. | Pedilanthus tithymaloides ssp. angustifolius | Euphorbiaceae
|
| PELA20 | Pedilanthus latifolius Millsp. & Britt. | Pedilanthus tithymaloides ssp. parasiticus | Euphorbiaceae
|
| PEPA36 | Pedilanthus padifolius (L.) Poit. | Pedilanthus tithymaloides ssp. padifolius | Euphorbiaceae
|
| PESM2 | Pedilanthus smallii Millsp. | Pedilanthus tithymaloides ssp. smallii | Euphorbiaceae
|