Pecan      

Pellitory          

Pencilflower          

Pennsylvania Bittercress      

Pennsylvania Blackberry          

Pennsylvania Buttercup      

Pennsylvania Cinquefoil          

Pennsylvania Pellitory          

Pennsylvania Sedge          

Pennsylvania Smartweed      

Pennycress          

Penthorum          

Peppermint          

Peppervine      

Pepperweed          

Perennial Pea          

Perennial Ryegrass      

Perennial Wallrocket          

Perilla          

Periwinkle          

Perplexed Ticktrefoil      

Peruvian Mock Vervain          

Pestilence Wort          

Petty Spurge          

Petunia          

Phacelia          

Philadelphia Fleabane      

Philadelphia Panicgrass          

Phlox          

Phryma          

Pickerelweed      

Pickleweed          

Piedmont Bedstraw          

Pigeonwings          

Pignut Hickory      

Pigweed          

Pimpernel          

Pin Cherry      

Pin Oak      

Pine          

Pine Barren Flatsedge          

Pineland Threeseed Mercury          

Pinesap          

Pink