| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| PLHY4 | Placynthiella hyporhoda (Th. Fr.) Coppins & P. James | | Trapeliaceae
|
| PLIC | Placynthiella icmalea (Ach.) Coppins & P. James | | Trapeliaceae
|
| PLOL2 | Placynthiella oligotropha (J. R. Laundon) Coppins & P. James | | Trapeliaceae
|
| PLUL | Placynthiella uliginosa (Schrader) Coppins & P. James | | Trapeliaceae
|
| PLACY2 | Placynthiella Elenkin | placynthiella | Trapeliaceae
|
| PLAS60 | Placynthium asperellum (Ach.) Trevisan | blackthread lichen | Placynthiaceae
|
| PLAS4 | Placynthium aspratile (Ach.) Henssen | Placynthium asperellum | Placynthiaceae
|
| PLDU2 | Placynthium dubium Herre | Massalongia microphylliza | Peltigeraceae
|
| PLFL3 | Placynthium flabellosum (Tuck.) Zahlbr. | blackthread lichen | Placynthiaceae
|
| PLMI3 | Placynthium microphyllizum (Nyl. ex Hasse) Hasse | Massalongia microphylliza | Peltigeraceae
|
| PLNI60 | Placynthium nigrum (Hudson) Gray | blackthread lichen | Placynthiaceae
|
| PLPE3 | Placynthium petersii (Nyl.) Burnham | Peters' blackthread lichen | Placynthiaceae
|
| PLSTI | Placynthium stenophyllum (Tuck.) Fink var. isidiatum Henssen | blackthread lichen | Placynthiaceae
|
| PLST5 | Placynthium stenophyllum (Tuck.) Fink | blackthread lichen | Placynthiaceae
|
| PLSU4 | Placynthium subnigrum de Lesd. | Peccania subnigra | Lichinaceae
|
| PLSU3 | Placynthium subradiatum (Nyl.) Arnold | blackthread lichen | Placynthiaceae
|
| PLACY3 | Placynthium (Ach.) Gray | blackthread lichen | Placynthiaceae
|
| PLAC | Plagiobothrys acanthocarpus (Piper) I.M. Johnston | adobe popcornflower | Boraginaceae
|
| PLARC | Plagiobothrys arizonicus (Gray) Greene ex Gray var. catalinensis Gray | Plagiobothrys canescens var. catalinensis | Boraginaceae
|
| PLAR | Plagiobothrys arizonicus (Gray) Greene ex Gray | Arizona popcornflower | Boraginaceae
|
| PLAS | Plagiobothrys asper Greene | Plagiobothrys tenellus | Boraginaceae
|
| PLAU | Plagiobothrys austiniae (Greene) I.M. Johnston | Austin's popcornflower | Boraginaceae
|
| PLBRA | Plagiobothrys bracteatus (T.J. Howell) I.M. Johnston var. aculeolatus (Piper) I.M. Johnston | bracted popcornflower | Boraginaceae
|
| PLBRB | Plagiobothrys bracteatus (T.J. Howell) I.M. Johnston var. bracteatus | bracted popcornflower | Boraginaceae
|
| PLBR | Plagiobothrys bracteatus (T.J. Howell) I.M. Johnston | bracted popcornflower | Boraginaceae
|
| PLCAF | Plagiobothrys californicus (Gray) Greene var. fulvescens I.M. Johnston | Plagiobothrys collinus var. fulvescens | Boraginaceae
|
| PLCAG | Plagiobothrys californicus (Gray) Greene var. gracilis I.M. Johnston | Plagiobothrys collinus var. gracilis | Boraginaceae
|
| PLCAU | Plagiobothrys californicus (Gray) Greene var. ursinus (Gray) I.M. Johnston | Plagiobothrys collinus var. ursinus | Boraginaceae
|
| PLCA | Plagiobothrys californicus (Gray) Greene | Plagiobothrys collinus var. californicus | Boraginaceae
|
| PLCA13 | Plagiobothrys campestris Greene | Plagiobothrys fulvus var. campestris | Boraginaceae
|
| PLCAC3 | Plagiobothrys canescens Benth. var. canescens | valley popcornflower | Boraginaceae
|
| PLCAC4 | Plagiobothrys canescens Benth. var. catalinensis (Gray) Jepson | Catalina popcornflower | Boraginaceae
|
| PLCA2 | Plagiobothrys canescens Benth. | valley popcornflower | Boraginaceae
|
| PLCHC | Plagiobothrys chorisianus (Cham.) I.M. Johnston var. chorisianus | artist's popcornflower | Boraginaceae
|
| PLCHH | Plagiobothrys chorisianus (Cham.) I.M. Johnston var. hickmanii (Greene) I.M. Johnston | Hickman's popcornflower | Boraginaceae
|
| PLCHU | Plagiobothrys chorisianus (Cham.) I.M. Johnston var. undulatus (Piper) Higgins, comb. nov. ined. | artist's popcornflower | Boraginaceae
|
| PLCH | Plagiobothrys chorisianus (Cham.) I.M. Johnston | artist's popcornflower | Boraginaceae
|
| PLCO10 | Plagiobothrys cognatus (Greene) I.M. Johnston | Plagiobothrys scouleri var. hispidulus | Boraginaceae
|
| PLCOC | Plagiobothrys collinus (Phil.) I.M. Johnston var. californicus (Gray) Higgins | Cooper's popcornflower | Boraginaceae
|
| PLCOF | Plagiobothrys collinus (Phil.) I.M. Johnston var. fulvescens (I.M. Johnston) Higgins | Cooper's popcornflower | Boraginaceae
|
| PLCOG | Plagiobothrys collinus (Phil.) I.M. Johnston var. gracilis (I.M. Johnston) Higgins | Cooper's popcornflower | Boraginaceae
|
| PLCOU | Plagiobothrys collinus (Phil.) I.M. Johnston var. ursinus (Gray) Higgins | Cooper's popcornflower | Boraginaceae
|
| PLCO13 | Plagiobothrys collinus (Phil.) I.M. Johnston | Cooper's popcornflower | Boraginaceae
|
| PLCU2 | Plagiobothrys cusickii (Greene) I.M. Johnston | Plagiobothrys scouleri var. cusickii | Boraginaceae
|
| PLDI | Plagiobothrys diffusus (Greene) I.M. Johnston | Plagiobothrys torreyi var. diffusus | Boraginaceae
|
| PLDI2 | Plagiobothrys distantiflorus (Piper) I.M. Johnston ex M.E. Peck | California popcornflower | Boraginaceae
|
| PLFIC | Plagiobothrys figuratus (Piper) I.M. Johnston ex M.E. Peck ssp. corallicarpus (Piper) Chambers | fragrant popcornflower | Boraginaceae
|
| PLFIF | Plagiobothrys figuratus (Piper) I.M. Johnston ex M.E. Peck ssp. figuratus | fragrant popcornflower | Boraginaceae
|
| PLFI | Plagiobothrys figuratus (Piper) I.M. Johnston ex M.E. Peck | fragrant popcornflower | Boraginaceae
|
| PLFUC | Plagiobothrys fulvus (Hook. & Arn.) I.M. Johnston var. campestris (Greene) I.M. Johnston | fulvous popcornflower | Boraginaceae
|
| PLFU | Plagiobothrys fulvus (Hook. & Arn.) I.M. Johnston | fulvous popcornflower | Boraginaceae
|
| PLGL | Plagiobothrys glaber (Gray) I.M. Johnston | hairless popcornflower | Boraginaceae
|
| PLGL4 | Plagiobothrys glomeratus Gray | clustered popcornflower | Boraginaceae
|
| PLGLG | Plagiobothrys glyptocarpus (Piper) I.M. Johnston var. glyptocarpus | sculptured popcornflower | Boraginaceae
|
| PLGLM | Plagiobothrys glyptocarpus (Piper) I.M. Johnston var. modestus I.M. Johnston | sculptured popcornflower | Boraginaceae
|
| PLGL2 | Plagiobothrys glyptocarpus (Piper) I.M. Johnston | sculptured popcornflower | Boraginaceae
|
| PLGR3 | Plagiobothrys granulatus (Piper) I.M. Johnston | Plagiobothrys scouleri var. scouleri | Boraginaceae
|
| PLGR | Plagiobothrys greenei (Gray) I.M. Johnston | Greene's popcornflower | Boraginaceae
|
| PLHA | Plagiobothrys harknessii Greene | Plagiobothrys kingii var. harknessii | Boraginaceae
|
| PLHIC | Plagiobothrys hirtus (Greene) I.M. Johnston var. corallicarpus (Piper) I.M. Johnston | Plagiobothrys figuratus ssp. corallicarpus | Boraginaceae
|
| PLHIF | Plagiobothrys hirtus (Greene) I.M. Johnston var. figuratus (Piper) I.M. Johnston | Plagiobothrys figuratus ssp. figuratus | Boraginaceae
|
| PLHI6 | Plagiobothrys hirtus (Greene) I.M. Johnston | rough popcornflower | Boraginaceae
|
| PLHI7 | Plagiobothrys hispidulus (Greene) I.M. Johnston | Plagiobothrys scouleri var. hispidulus | Boraginaceae
|
| PLHI3 | Plagiobothrys hispidus Gray | Cascade popcornflower | Boraginaceae
|
| PLHU | Plagiobothrys humistratus (Greene) I.M. Johnston | dwarf popcornflower | Boraginaceae
|
| PLHY | Plagiobothrys hystriculus (Piper) I.M. Johnston | bearded popcornflower | Boraginaceae
|
| PLIN | Plagiobothrys infectivus I.M. Johnston | dye popcornflower | Boraginaceae
|
| PLJO | Plagiobothrys jonesii Gray | Mojave popcornflower | Boraginaceae
|
| PLKIH | Plagiobothrys kingii (S. Wats.) Gray var. harknessii (Greene) Jepson | Harness' popcornflower | Boraginaceae
|
| PLKIK | Plagiobothrys kingii (S. Wats.) Gray var. kingii | Great Basin popcornflower | Boraginaceae
|
| PLKI | Plagiobothrys kingii (S. Wats.) Gray | Great Basin popcornflower | Boraginaceae
|
| PLLA3 | Plagiobothrys lamprocarpus (Piper) I.M. Johnston | shinyfruit popcornflower | Boraginaceae
|
| PLLE | Plagiobothrys leptocladus (Greene) I.M. Johnston | finebranched popcornflower | Boraginaceae
|
| PLLI | Plagiobothrys lithocaryus (Greene ex Gray) I.M. Johnston | Mayacamas popcornflower | Boraginaceae
|
| PLMOM | Plagiobothrys mollis (Gray) I.M. Johnston var. mollis | soft popcornflower | Boraginaceae
|
| PLMOV | Plagiobothrys mollis (Gray) I.M. Johnston var. vestitus (Greene) I.M. Johnston | soft popcornflower | Boraginaceae
|
| PLMO | Plagiobothrys mollis (Gray) I.M. Johnston | soft popcornflower | Boraginaceae
|
| PLMY | Plagiobothrys myosotoides (Lehm.) Brand | forget-me-not popcornflower | Boraginaceae
|
| PLNE2 | Plagiobothrys nelsonii (Greene) I.M. Johnston | Plagiobothrys scouleri var. hispidulus | Boraginaceae
|
| PLNO | Plagiobothrys nothofulvus (Gray) Gray | rusty popcornflower | Boraginaceae
|
| PLOR | Plagiobothrys orientalis (L.) I.M. Johnston | oriental popcornflower | Boraginaceae
|
| PLOR5 | Plagiobothrys orthocarpus (Greene) I.M. Johnston | Plagiobothrys leptocladus | Boraginaceae
|
| PLPA | Plagiobothrys parishii I.M. Johnston | Parish's popcornflower | Boraginaceae
|
| PLPR3 | Plagiobothrys pringlei Greene | Pringle's popcornflower | Boraginaceae
|
| PLRER | Plagiobothrys reticulatus (Piper) I.M. Johnston var. rossianorum I.M. Johnston | Plagiobothrys scouleri var. scouleri | Boraginaceae
|
| PLRE | Plagiobothrys reticulatus (Piper) I.M. Johnston | netted popcornflower | Boraginaceae
|
| PLSA3 | Plagiobothrys salsus (Brandeg.) I.M. Johnston | salty popcornflower | Boraginaceae
|
| PLSC | Plagiobothrys scopulorum (Greene) I.M. Johnston | Plagiobothrys scouleri var. hispidulus | Boraginaceae
|
| PLSCP2 | Plagiobothrys scouleri (Hook. & Arn.) I.M. Johnston ssp. penicillatus (Greene) A. L�ve | Plagiobothrys scouleri var. hispidulus | Boraginaceae
|
| PLSCC | Plagiobothrys scouleri (Hook. & Arn.) I.M. Johnston var. cusickii (Greene) Higgins | Cusick's popcornflower | Boraginaceae
|
| PLSCH | Plagiobothrys scouleri (Hook. & Arn.) I.M. Johnston var. hispidulus (Greene) Dorn | sleeping popcornflower | Boraginaceae
|
| PLSCP | Plagiobothrys scouleri (Hook. & Arn.) I.M. Johnston var. penicillatus (Greene) Cronq. | Plagiobothrys scouleri var. hispidulus | Boraginaceae
|
| PLSCS | Plagiobothrys scouleri (Hook. & Arn.) I.M. Johnston var. scouleri | Scouler's popcornflower | Boraginaceae
|
| PLSC2 | Plagiobothrys scouleri (Hook. & Arn.) I.M. Johnston | Scouler's popcornflower | Boraginaceae
|
| PLSC3 | Plagiobothrys scriptus (Greene) I.M. Johnston | scribe popcornflower | Boraginaceae
|
| PLSH | Plagiobothrys shastensis Greene ex Gray | Shasta popcornflower | Boraginaceae
|
| PLSTM | Plagiobothrys stipitatus (Greene) I.M. Johnston var. micranthus (Piper) I.M. Johnston | stalked popcornflower | Boraginaceae
|
| PLSTS | Plagiobothrys stipitatus (Greene) I.M. Johnston var. stipitatus | stalked popcornflower | Boraginaceae
|
| PLST | Plagiobothrys stipitatus (Greene) I.M. Johnston | stalked popcornflower | Boraginaceae
|
| PLST2 | Plagiobothrys strictus (Greene) I.M. Johnston | Calistoga popcornflower | Boraginaceae
|
| PLTE | Plagiobothrys tenellus (Nutt. ex Hook.) Gray | Pacific popcornflower | Boraginaceae
|