Plant Database (by name)

Pennsylvania cinquefoil - Potentilla pensylvanica L. var. litoralis (Rydb.) Boivin

Pennsylvania everlasting - Gamochaeta pensylvanica (Willd.) Cabrera

Pennsylvania pellitory - Parietaria pensylvanica Muhl. ex Willd.

Pennsylvania rush - Juncus gymnocarpus Coville

Pennsylvania sedge - Carex pensylvanica Lam.

Pennsylvania smartweed - Polygonum pensylvanicum L.

peony - Paeonia corallina Retz.

peppermint - Mentha ×piperita L. (pro sp.) [aquatica × spicata]

peppervine - Ampelopsis arborea (L.) Koehne

peregrine thistle - Cirsium cymosum (Greene) J.T. Howell

perennial fringed gentian - Gentianopsis barbellata (Engelm.) Iltis

perennial honesty - Lunaria rediviva L.

perennial pea - Lathyrus latifolius L.

perennial quakinggrass - Briza media L.

perennial rockcress - Arabis perennans S. Wats.

perennial ryegrass - Lolium perenne L.

perennial saltmarsh aster - Symphyotrichum tenuifolium (L.) Nesom

perennial sandgrass - Triplasis americana Beauv.

perennial soybean - Neonotonia wightii (Wight & Arn.) Lackey

perennial veldtgrass - Ehrharta calycina Sm.

perennial wallrocket - Diplotaxis tenuifolia (L.) DC.

perfoliate bellwort - Uvularia perfoliata L.

perfumeballs - Gaillardia suavis (Gray & Engelm.) Britt. & Rusby

perkysue - Tetraneuris argentea (Gray) Greene

perplexed ticktrefoil - Desmodium perplexum Schub.

Persian carpet flower - Edithcolea grandis N.E. Br.

Persian ironwood - Parrotia persica (DC.) C.A. Mey.

Persian ryegrass - Lolium persicum Boiss. & Hohen. ex Boiss.

persistent wakerobin - Trillium persistens Duncan

Peruvian feathergrass - Stipa ichu (Ruiz & Pavón) Kunth

Peruvian mock vervain - Glandularia peruviana (L.) Small

Peruvian muhly - Muhlenbergia peruviana (Beauv.) Steud.

Peruvian primrose-willow - Ludwigia peruviana (L.) Hara

Peruvian watergrass - Luziola peruviana Juss. ex J.F. Gmel.

Peruvian-lily - Alstroemeria aurea Graham

B. Mey. & Scherb. - Petasites hybridus (L.) P.G. Gaertn.

petty spurge - Euphorbia peplus L.

petunia - Petunia Juss.

phacelia - Phacelia Juss.

phantom orchid - Cephalanthera austiniae (Gray) Heller

Philadelphia fleabane - Erigeron philadelphicus L.

Philadelphia panicgrass - Panicum philadelphicum Bernh. ex Trin.

Philibert's thuidium moss - Thuidium philibertii Limpr.

Philippine evergreen - Aglaonema commutatum Schott

Philippine ground orchid - Spathoglottis plicata Blume

Philippine violet - Barleria L.

philonotis moss - Philonotis capillaris Lindb. in Hartm.

philonotis moss - Philonotis fontana (Hedw.) Brid.

philonotis moss - Philonotis fontana (Hedw.) Brid. var. pumila (Turn.) Brid.

philonotis moss - Philonotis marchica (Hedw.) Brid.