| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| PACU4 | Parathelium cuyabense Malme | Pyrenula cuyabensis | Pyrenulaceae
|
| PAEM | Parathelium emergens Nyl. ex Mull. Arg. | Pyrenula erumpens | Pyrenulaceae
|
| PAMA22 | Parathelium martinicanum Vainio | Pyrenula martinicana | Pyrenulaceae
|
| PAMI16 | Parathelium microcarpum Riddle | Pyrenula microtheca | Pyrenulaceae
|
| PASU12 | Parathelium subferrugineum Malme | Pyrenula subferruginea | Pyrenulaceae
|
| PACR2 | Parathesis crenulata (Vent.) Hook. f. | scratchthroat | Myrsinaceae
|
| PASE9 | Parathesis serrulata auct. non (Sw.) Mez | Parathesis crenulata | Myrsinaceae
|
| PARAT | Parathesis (A. DC.) Hook. f. | parathesis | Myrsinaceae
|
| PALA28 | Parentucellia latifolia (L.) Caruel | broadleaf glandweed | Scrophulariaceae
|
| PAVI3 | Parentucellia viscosa (L.) Caruel | yellow glandweed | Scrophulariaceae
|
| PAREN | Parentucellia Viviani | glandweed | Scrophulariaceae
|
| PADE21 | Parietaria debilis auct. non Forst. f. | Parietaria floridana | Urticaceae
|
| PADI12 | Parietaria diffusa Mert. & Koch | Parietaria judaica | Urticaceae
|
| PAFL3 | Parietaria floridana Nutt. | Florida pellitory | Urticaceae
|
| PAHEC | Parietaria hespera Hinton var. californica Hinton | California pellitory | Urticaceae
|
| PAHEH | Parietaria hespera Hinton var. hespera | rillita pellitory | Urticaceae
|
| PAHE5 | Parietaria hespera Hinton | rillita pellitory | Urticaceae
|
| PAJU | Parietaria judaica L. | spreading pellitory | Urticaceae
|
| PAMI11 | Parietaria microphylla L. | Pilea microphylla | Urticaceae
|
| PANU6 | Parietaria nummularia Small | Parietaria floridana | Urticaceae
|
| PAOB3 | Parietaria obtusa Rydb. ex Small | Parietaria pensylvanica | Urticaceae
|
| PAOC4 | Parietaria occidentalis Rydb. | Parietaria pensylvanica | Urticaceae
|
| PAOF | Parietaria officinalis L. | upright pellitory | Urticaceae
|
| PAPEO | Parietaria pensylvanica Muhl. ex Willd. var. obtusa (Rydb. ex Small) Shinners | Parietaria pensylvanica | Urticaceae
|
| PAPE5 | Parietaria pensylvanica Muhl. ex Willd. | Pennsylvania pellitory | Urticaceae
|
| PAPR6 | Parietaria praetermissa Hinton | clustered pellitory | Urticaceae
|
| PAZE | Parietaria zeylanica L. | Pouzolzia zeylanica | Urticaceae
|
| PARIE | Parietaria L. | pellitory | Urticaceae
|
| PACA10 | Parishella californica Gray | Mojave dwarf | Campanulaceae
|
| PARIS | Parishella Gray | parishella | Campanulaceae
|
| PAEL2 | Pariti elatum (Sw.) G. Don | Hibiscus elatus | Malvaceae
|
| PAGR2 | Pariti grande Britt. ex Small | Hibiscus tiliaceus | Malvaceae
|
| PATI2 | Pariti tiliaceum (L.) A. Juss. ex Britt. & Millsp. | Hibiscus tiliaceus | Malvaceae
|
| PAAF2 | Parkia africana R. Br. | Parkia clappertoniana | Fabaceae
|
| PABI10 | Parkia bicolor A. Chev. | bicolor parkia | Fabaceae
|
| PACL9 | Parkia clappertoniana Keay | Clapperton's parkia | Fabaceae
|
| PAFI12 | Parkia filicoidea Welw. ex Oliver | African locust bean | Fabaceae
|
| PASP15 | Parkia speciosa Hassk. | parkia | Fabaceae
|
| PARKI3 | Parkia R. Br. | parkia | Fabaceae
|
| PAAC3 | Parkinsonia aculeata L. | Jerusalem thorn | Fabaceae
|
| PAFL6 | Parkinsonia florida (Benth. ex Gray) S. Wats. | blue paloverde | Fabaceae
|
| PAMI5 | Parkinsonia microphylla Torr. | yellow paloverde | Fabaceae
|
| PATEM | Parkinsonia texana (Gray) S. Wats. var. macra (I.M. Johnston) Isely | Texas paloverde | Fabaceae
|
| PATET2 | Parkinsonia texana (Gray) S. Wats. var. texana | Texas paloverde | Fabaceae
|
| PATE10 | Parkinsonia texana (Gray) S. Wats. | Texas paloverde | Fabaceae
|
| PARKI2 | Parkinsonia L. | paloverde | Fabaceae
|
| PAAB2 | Parmelia abstrusa Vainio | Relicina abstrusa | Parmeliaceae
|
| PAAC12 | Parmelia acanthifolia Pers. | Rimelia cetrata | Parmeliaceae
|
| PAAH3 | Parmelia ahtii Essl. | Neofuscelia ahtii | Parmeliaceae
|
| PAAJ | Parmelia ajoensis T. Nash | Xanthoparmelia ajoensis | Parmeliaceae
|
| PAAL22 | Parmelia alabamensis Hale & McCull. | Paraparmelia alabamensis | Parmeliaceae
|
| PAAL23 | Parmelia albertana Ahti | Melanelia albertana | Parmeliaceae
|
| PAAL29 | Parmelia aleuritica Nyl. | Arctoparmelia centrifuga | Parmeliaceae
|
| PAAL24 | Parmelia almquistii Vainio | Allantoparmelia almquistii | Parmeliaceae
|
| PAAL25 | Parmelia alpicola Th. Fr. | Allantoparmelia alpicola | Parmeliaceae
|
| PAAM7 | Parmelia amazonica Nyl. | Canoparmelia amazonica | Parmeliaceae
|
| PAAN12 | Parmelia andreana Mull. Arg. | Flavopunctelia flaventior | Parmeliaceae
|
| PAAN13 | Parmelia antillensis Nyl. | Parmotremopsis antillensis | Parmeliaceae
|
| PAAP3 | Parmelia appalachensis Culb. | Punctelia appalachensis | Parmeliaceae
|
| PAAR12 | Parmelia arnoldii Du Rietz | Parmotrema arnoldii | Parmeliaceae
|
| PAAR13 | Parmelia arseneana Gyelnik | Xanthoparmelia novomexicana | Parmeliaceae
|
| PAAS4 | Parmelia aspera A. Massal. | Melanelia exasperata | Parmeliaceae
|
| PAAS5 | Parmelia aspidota (Ach.) Poetsch | Melanelia exasperata | Parmeliaceae
|
| PAAT | Parmelia atticoides Essl. | Neofuscelia atticoides | Parmeliaceae
|
| PAAU9 | Parmelia aurulenta Tuck. | Myelochroa aurulenta | Parmeliaceae
|
| PAAU10 | Parmelia austerodes Nyl. | Hypogymnia austerodes | Parmeliaceae
|
| PAAU11 | Parmelia austrosinensis Zahlbr. | Parmotrema austrosinense | Parmeliaceae
|
| PABA11 | Parmelia baltimorensis Gyelnik & Foriss | Flavoparmelia baltimorensis | Parmeliaceae
|
| PABIG | Parmelia birulae Elenkin var. grumosa Llano | Arctoparmelia separata | Parmeliaceae
|
| PABI9 | Parmelia bitteri Lynge | Hypogymnia bitteri | Parmeliaceae
|
| PABO9 | Parmelia bolliana Mull. Arg. | Punctelia bolliana | Parmeliaceae
|
| PABO10 | Parmelia borreri (Sm.) Turner | Punctelia borreri | Parmeliaceae
|
| PABR8 | Parmelia brunella Essl. | Neofuscelia brunella | Parmeliaceae
|
| PACAI | Parmelia caperata (L.) Ach. var. incorrupta (J. Moore) E. C. Berry | Flavopunctelia praesignis | Parmeliaceae
|
| PACA23 | Parmelia caperata (L.) Ach. | Flavoparmelia caperata | Parmeliaceae
|
| PACA24 | Parmelia caroliniana Nyl. | Canoparmelia caroliniana | Parmeliaceae
|
| PACA25 | Parmelia catawbiensis (Degel.) Hale & M. Wirth | Everniastrum catawbiense | Parmeliaceae
|
| PACE5 | Parmelia centrifuga (L.) Ach. | Arctoparmelia centrifuga | Parmeliaceae
|
| PACE4 | Parmelia cetrarioides (Delise ex Duby) Nyl. | Cetrelia cetrarioides | Parmeliaceae
|
| PACEH | Parmelia cetrata Ach. var. hypotropoides Nyl. ex Willey | Parmotrema hypotropum | Parmeliaceae
|
| PACE6 | Parmelia cetrata Ach. | Rimelia cetrata | Parmeliaceae
|
| PACH12 | Parmelia chiricahuensis R. Anderson & W. A. Weber | Neofuscelia chiricahuensis | Parmeliaceae
|
| PACH13 | Parmelia chlorochroa Tuck. | Xanthoparmelia chlorochroa | Parmeliaceae
|
| PACH14 | Parmelia chrysantha Tuck. | Parmotrema madagascariaceum | Parmeliaceae
|
| PACL7 | Parmelia cladonia (Tuck.) Du Rietz | Pseudevernia cladonia | Parmeliaceae
|
| PACL8 | Parmelia claudelii (Harm.) Vainio | Parmotrema stuppeum | Parmeliaceae
|
| PACO36 | Parmelia commensurata Hale | Rimelia commensurata | Parmeliaceae
|
| PACO37 | Parmelia concreta Stizenb. | Flavoparmelia concreta | Parmeliaceae
|
| PACO38 | Parmelia confoederata Culb. | Bulbothrix confoederata | Parmeliaceae
|
| PACO39 | Parmelia congruens Ach. | Pseudoparmelia sphaerospora | Parmeliaceae
|
| PACOS2 | Parmelia conspersa (Ehrh. ex Ach.) Ach. var. subconspersa (Nyl.) Gyelnik | Flavoparmelia rutidota | Parmeliaceae
|
| PACO40 | Parmelia conspersa (Ehrh. ex Ach.) Ach. | Xanthoparmelia conspersa | Parmeliaceae
|
| PACO41 | Parmelia conspurcata (Schaerer) Vainio | Melanelia subargentifera | Parmeliaceae
|
| PACO42 | Parmelia coronata Fee | Bulbothrix coronata | Parmeliaceae
|
| PACR10 | Parmelia crinita Ach. | Parmotrema crinitum | Parmeliaceae
|
| PACR11 | Parmelia cristifera Taylor | Parmotrema cristiferum | Parmeliaceae
|
| PACR12 | Parmelia croceopustulata Kurok. | Hypotrachyna croceopustulata | Parmeliaceae
|
| PACR13 | Parmelia crozalsiana de Lesd. ex Harm. | Canoparmelia crozalsiana | Parmeliaceae
|
| PACR14 | Parmelia cryptochlorophaea Hale | Canoparmelia cryptochlorophaea | Parmeliaceae
|
| PACU5 | Parmelia cubensis Nyl. | Pseudoparmelia sphaerospora | Parmeliaceae
|
| PACU6 | Parmelia cumberlandia (Gyelnik) Hale | Xanthoparmelia cumberlandia | Parmeliaceae
|