| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| PIGAS | Pittosporum gayanum Rock var. skottsbergii Sherff | Pittosporum gayanum | Pittosporaceae
|
| PIGAW | Pittosporum gayanum Rock var. waialealae Rock | Pittosporum gayanum | Pittosporaceae
|
| PIGA2 | Pittosporum gayanum Rock | Waialeale cheesewood | Pittosporaceae
|
| PIGLG | Pittosporum glabrum Hook. & Arn. var. glomeratum (Hbd.) Sherff | Pittosporum glabrum | Pittosporaceae
|
| PIGLI | Pittosporum glabrum Hook. & Arn. var. intermedium Sherff | Pittosporum glabrum | Pittosporaceae
|
| PIGLS | Pittosporum glabrum Hook. & Arn. var. spathulatum (Mann) Sherff | Pittosporum glabrum | Pittosporaceae
|
| PIGLT | Pittosporum glabrum Hook. & Arn. var. tinifolium Sherff | Pittosporum glabrum | Pittosporaceae
|
| PIGL4 | Pittosporum glabrum Hook. & Arn. | Koolau Range cheesewood | Pittosporaceae
|
| PIHA5 | Pittosporum halophiloides Sherff | Pittosporum confertiflorum | Pittosporaceae
|
| PIHA3 | Pittosporum halophilum Rock | Pittosporum confertiflorum | Pittosporaceae
|
| PIHA4 | Pittosporum hawaiiense Hbd. | Hawai'i cheesewood | Pittosporaceae
|
| PIHE5 | Pittosporum helleri Sherff | Pittosporum glabrum | Pittosporaceae
|
| PIHOL | Pittosporum hosmeri Rock var. longifolium Rock | Pittosporum hosmeri | Pittosporaceae
|
| PIHOS | Pittosporum hosmeri Rock var. st.-johnii Sherff | Pittosporum hosmeri | Pittosporaceae
|
| PIHO | Pittosporum hosmeri Rock | Kona cheesewood | Pittosporaceae
|
| PIINF | Pittosporum insigne Hbd. var. fosbergii Sherff | Pittosporum glabrum | Pittosporaceae
|
| PIINH | Pittosporum insigne Hbd. var. hillebrandii (Levl.) Sherff | Pittosporum glabrum | Pittosporaceae
|
| PIINL | Pittosporum insigne Hbd. var. lydgatei Sherff | Pittosporum glabrum | Pittosporaceae
|
| PIINM | Pittosporum insigne Hbd. var. micranthum Sherff | Pittosporum glabrum | Pittosporaceae
|
| PIINP | Pittosporum insigne Hbd. var. pelekunuanum Sherff | Pittosporum glabrum | Pittosporaceae
|
| PIIN3 | Pittosporum insigne Hbd. | Pittosporum glabrum | Pittosporaceae
|
| PIKA2 | Pittosporum kahananum Sherff | Pittosporum glabrum | Pittosporaceae
|
| PIKAP | Pittosporum kauaiense Hbd. var. phaeocarpum Sherff | Pittosporum kauaiense | Pittosporaceae
|
| PIKAR | Pittosporum kauaiense Hbd. var. repens Sherff | Pittosporum kauaiense | Pittosporaceae
|
| PIKA3 | Pittosporum kauaiense Hbd. | Kauai cheesewood | Pittosporaceae
|
| PIKI | Pittosporum kiloneae St. John | Pittosporum terminalioides | Pittosporaceae
|
| PILA4 | Pittosporum lanaiense St. John | Pittosporum confertiflorum | Pittosporaceae
|
| PIMO4 | Pittosporum �monae Rock ex St. John (pro sp.) | | Pittosporaceae
|
| PINA | Pittosporum napaliense Sherff | royal cheesewood | Pittosporaceae
|
| PIPE8 | Pittosporum pentandrum (Blanco) Merr. | Taiwanese cheesewood | Pittosporaceae
|
| PIRA6 | Pittosporum ralphii Kirk | Ralph's desertwillow | Pittosporaceae
|
| PIRE8 | Pittosporum resiniferum Hemsley | resin cheesewood | Pittosporaceae
|
| PISUR | Pittosporum sulcatum Sherff var. remyi Sherff | Pittosporum glabrum | Pittosporaceae
|
| PISUR2 | Pittosporum sulcatum Sherff var. rumicifolium Sherff | Pittosporum glabrum | Pittosporaceae
|
| PISU3 | Pittosporum sulcatum Sherff | Pittosporum glabrum | Pittosporaceae
|
| PITE11 | Pittosporum tenuifolium Gaertn. | tawhiwhi | Pittosporaceae
|
| PITEL | Pittosporum terminalioides Planch. ex Gray var. lanaiense Sherff | Pittosporum terminalioides | Pittosporaceae
|
| PITEM | Pittosporum terminalioides Planch. ex Gray var. macrocarpum Sherff | Pittosporum terminalioides | Pittosporaceae
|
| PITEM2 | Pittosporum terminalioides Planch. ex Gray var. macropus Skottsberg | Pittosporum terminalioides | Pittosporaceae
|
| PITEM3 | Pittosporum terminalioides Planch. ex Gray var. mauiense Sherff | Pittosporum terminalioides | Pittosporaceae
|
| PITE5 | Pittosporum terminalioides Planch. ex Gray | cream cheesewood | Pittosporaceae
|
| PITO2 | Pittosporum tobira (Thunb.) Ait. f. | Japanese cheesewood | Pittosporaceae
|
| PIUN2 | Pittosporum undulatum Vent. | Australian cheesewood | Pittosporaceae
|
| PIVI5 | Pittosporum viridiflorum Sims | cape cheesewood | Pittosporaceae
|
| PITTO | Pittosporum Banks ex Soland. | cheesewood | Pittosporaceae
|
| PIAD2 | Pityopsis adenolepis (Fern.) Semple | Carolina silkgrass | Asteraceae
|
| PIAS2 | Pityopsis aspera (Shuttlw. ex Small) Small | pineland silkgrass | Asteraceae
|
| PIFA | Pityopsis falcata (Pursh) Nutt. | sickleleaf silkgrass | Asteraceae
|
| PIFL5 | Pityopsis flexuosa (Nash) Small | zigzag silkgrass | Asteraceae
|
| PIGRA | Pityopsis graminifolia (Michx.) Nutt. var. aequilifolia Bowers & Semple | narrowleaf silkgrass | Asteraceae
|
| PIGRG | Pityopsis graminifolia (Michx.) Nutt. var. graminifolia | narrowleaf silkgrass | Asteraceae
|
| PIGRL | Pityopsis graminifolia (Michx.) Nutt. var. latifolia (Fern.) Semple & Bowers | narrowleaf silkgrass | Asteraceae
|
| PIGRM | Pityopsis graminifolia (Michx.) Nutt. var. microcephala (Small) Semple | Pityopsis graminifolia var. tenuifolia | Asteraceae
|
| PIGRT | Pityopsis graminifolia (Michx.) Nutt. var. tenuifolia (Torr.) Semple & Bowers | narrowleaf silkgrass | Asteraceae
|
| PIGRT2 | Pityopsis graminifolia (Michx.) Nutt. var. tracyi (Small) Semple | Tracy's silkgrass | Asteraceae
|
| PIGR4 | Pityopsis graminifolia (Michx.) Nutt. | narrowleaf silkgrass | Asteraceae
|
| PIMI4 | Pityopsis microcephala (Small) Small | Pityopsis graminifolia var. tenuifolia | Asteraceae
|
| PIOL | Pityopsis oligantha (Chapman ex Torr. & Gray) Small | grassleaf goldaster | Asteraceae
|
| PIPI4 | Pityopsis pinifolia (Ell.) Nutt. | Taylor County goldaster | Asteraceae
|
| PIRU3 | Pityopsis ruthii (Small) Small | Ruth's goldaster | Asteraceae
|
| PITR6 | Pityopsis tracyi (Small) Small | Pityopsis graminifolia var. tracyi | Asteraceae
|
| PITYO2 | Pityopsis Nutt. | silkgrass | Asteraceae
|
| PICA9 | Pityopus californica (Eastw.) Copeland f. | California pinefoot | Monotropaceae
|
| PITYO | Pityopus Small | pinefoot | Monotropaceae
|
| PIAN5 | Pityothamnus angustifolius (Raf.) Small | Asimina angustifolia | Annonaceae
|
| PIIN4 | Pityothamnus incanus (Bartr.) Small | Asimina incana | Annonaceae
|
| PIOB2 | Pityothamnus obovatus (Willd.) Small | Asimina obovata | Annonaceae
|
| PIPY | Pityothamnus pygmeus (Bartr.) Small | Asimina pygmea | Annonaceae
|
| PIRE7 | Pityothamnus reticulatus (Shuttlw. ex Chapman) Small | Asimina reticulata | Annonaceae
|
| PITE7 | Pityothamnus tetramerus (Small) Small | Asimina tetramera | Annonaceae
|
| PIAU4 | Pityrogramma austroamericana Domin | leatherleaf goldback fern | Pteridaceae
|
| PICAA | Pityrogramma calomelanos (L.) Link var. aureoflava (Hook.) Weatherby ex Bailey | Pityrogramma austroamericana | Pteridaceae
|
| PICAA2 | Pityrogramma calomelanos (L.) Link var. austroamericana (Domin) Farw. | Pityrogramma austroamericana | Pteridaceae
|
| PICA4 | Pityrogramma calomelanos (L.) Link | Dixie silverback fern | Pteridaceae
|
| PICHG | Pityrogramma chrysophylla (Sw.) Link var. gabrielae Domin | island goldback fern | Pteridaceae
|
| PICHS | Pityrogramma chrysophylla (Sw.) Link var. subflexuosa (Domin) Proctor | island goldback fern | Pteridaceae
|
| PICH | Pityrogramma chrysophylla (Sw.) Link | island goldback fern | Pteridaceae
|
| PIEB | Pityrogramma ebenea (L.) Proctor | mountain silverback fern | Pteridaceae
|
| PIMA12 | Pityrogramma �mackenneyi W.H. Wagner | | Pteridaceae
|
| PIPA5 | Pityrogramma pallida (Weatherby) Alt & V. Grant | Pentagramma pallida | Pteridaceae
|
| PISE6 | Pityrogramma semipallida J.T. Howell | Pentagramma triangularis ssp. semipallida | Pteridaceae
|
| PISU4 | Pityrogramma subflexuosa Domin | Pityrogramma chrysophylla var. subflexuosa | Pteridaceae
|
| PISU2 | Pityrogramma sulphurea (Sw.) Maxon | Jamaican goldback fern | Pteridaceae
|
| PITA3 | Pityrogramma tartarea auct. non (Cav.) Maxon | Pityrogramma ebenea | Pteridaceae
|
| PITRM | Pityrogramma triangularis (Kaulfuss) Maxon var. maxonii Weatherby | Pentagramma triangularis ssp. maxonii | Pteridaceae
|
| PITRP | Pityrogramma triangularis (Kaulfuss) Maxon var. pallida Weatherby | Pentagramma pallida | Pteridaceae
|
| PITRS | Pityrogramma triangularis (Kaulfuss) Maxon var. semipallida J.T. Howell | Pentagramma triangularis ssp. semipallida | Pteridaceae
|
| PITRV | Pityrogramma triangularis (Kaulfuss) Maxon var. viridis Hoover | Pentagramma triangularis ssp. semipallida | Pteridaceae
|
| PITRV2 | Pityrogramma triangularis (Kaulfuss) Maxon var. viscosa (D.C. Eat.) Weatherby | Pentagramma triangularis ssp. viscosa | Pteridaceae
|
| PITR | Pityrogramma triangularis (Kaulfuss) Maxon | Pentagramma triangularis ssp. triangularis | Pteridaceae
|
| PITR2 | Pityrogramma trifoliata (L.) R. Tryon | threeleaf goldback fern | Pteridaceae
|
| PIVI3 | Pityrogramma viscosa (D.C. Eat.) Maxon | Pentagramma triangularis ssp. viscosa | Pteridaceae
|
| PITYR | Pityrogramma Link | goldback fern | Pteridaceae
|
| PLCE2 | Placidiopsis cervinula (Nyl.) Vainio | | Verrucariaceae
|
| PLCI5 | Placidiopsis cinerascens (Nyl.) Breuss | | Verrucariaceae
|
| PLMI2 | Placidiopsis minor R. C. Harris | | Verrucariaceae
|
| PLPS3 | Placidiopsis pseudocinerea Breuss | | Verrucariaceae
|
| PLACI | Placidiopsis Beltram. | placidiopsis | Verrucariaceae
|
| PLCR3 | Placopsis cribellans (Nyl.) Rasanen | bullseye lichen | Trapeliaceae
|
| PLGE2 | Placopsis gelida (L.) Lindsay | bullseye lichen | Trapeliaceae
|
| PLRO7 | Placopsis roseonigra Brodo | bullseye lichen | Trapeliaceae
|