Pennsylvania Bittercress      

Pennsylvania Blackberry          

Pennsylvania Buttercup      

Pennsylvania Catchfly          

Pennsylvania Clubmoss          

Pennsylvania Hawthorn          

Pennsylvania Pellitory          

Pennsylvania Sedge          

Pennsylvania Smartweed      

Pennycress          

Pennyroyal          

Penthorum          

Peppermint          

Peppervine          

Pepperweed          

Perennial Pea          

Perennial Ryegrass      

Perennial Saltmarsh Aster          

Perennial Wallrocket          

Perfoliate Bellwort          

Perilla          

Periploca          

Periwinkle          

Peruvian Groundcherry          

Pestilence Wort          

Petty Spurge          

Petunia          

Philadelphia Blackberry          

Philadelphia Fleabane      

Philadelphia Panicgrass          

Phlox          

Phryma          

Pickerelweed      

Pickleweed          

Piedmont Bladderwort          

Piedmont Staggerbush          

Pigeonwings          

Pignut Hickory      

Pigweed          

Pilgrim Grape          

Pimpernel          

Pin Cherry      

Pin Oak      

Pincushions