Pecan      

Pellitory          

Pencilflower          

Pennsylvania Bittercress      

Pennsylvania Blackberry          

Pennsylvania Catchfly          

Pennsylvania Clubmoss          

Pennsylvania Pellitory          

Pennsylvania Sedge          

Pennsylvania Smartweed      

Pennycress          

Penthorum          

Peony          

Peppermint          

Peppervine      

Pepperweed          

Perennial Pea          

Perennial Ryegrass      

Perfoliate Bellwort          

Perilla          

Periwinkle          

Perplexed Ticktrefoil      

Peruvian Dodder          

Peruvian Groundcherry          

Petunia          

Phacelia          

Philadelphia Blackberry          

Philadelphia Fleabane      

Philadelphia Panicgrass          

Philippine Lily          

Phlox          

Phryma          

Pickerelweed      

Piedmont Bedstraw          

Piedmont Rhododendron          

Pigeonwings          

Pignut Hickory      

Pigweed          

Pimpernel          

Pin Oak      

Pine          

Pine Barren Deathcamas          

Pine Barren Flatsedge          

Pineland Threeseed Mercury