 Polemonium reptans (Greek Valerian) - White Stamens |
 Polemonium reptans (Greek Valerian) - Yellow Stamens |
 Polygala cruciata (Cross-Leaved Milkwort) |
 Polygala paucifolia (Fringed Polygala) |
 Polygala polygama (Racemed Milkwort) |
 Polygala sanguinea (Field Milkwort) |
 Polygala senega (Seneca Snakeroot) |
 Polygala verticillata (Whorled Milkwort) |
 Polygonatum canaliculatum (Giant Solomon’s-Seal) |
 Polygonum tenue (Slender Knotweed) |
 Polymnia canadensis (White Leafcup) |
 Pontederia cordata (Pickerelweed) |
 Populus deltoides (Eastern Cottonwood) - Female Flowers |
 Populus deltoides (Eastern Cottonwood) - Male Flowers |
 Populus tremuloides (Quaking Aspen) |
 Potamogeton species (Pondweed) |
 Potentilla anserina (Silverweed) |
 Potentilla canadensis (Dwarf Cinquefoil) |
 Potentilla norvegica (Rough Cinquefoil) |
 Potentilla simplex (Common Cinquefoil) |
 Potentilla supina (Bushy Cinquefoil) |
 Prenanthes alba (White Rattlesnake-Root) |
 Prenanthes altissima (Tall White Lettuce) |
 Prenanthes crepidinea (Nodding Rattlesnake-Root) |
 Prenanthes racemosa (Smooth White Lettuce) |
 Primula mistassinica (Bird's-Eye Primrose) |
 Prosartes lanuginosa (Fairy-Bells) |
 Proserpinaca palustris (Mermaid-Weed) |
 Prunella vulgaris (Heal-All) |
 Prunus pensylvanica (Pin Cherry) |
 Prunus pumila (Sand Cherry) |
 Prunus serotina (Black Cherry) |
 Prunus virginiana (Choke Cherry) |
 Pseudognaphalium obtusifolium (Sweet Everlasting) |
 Ptelea trifoliata (Hoptree) |
 Pycnanthemum muticum (Short-Toothed Mountain-Mint) |
 Pycnanthemum tenuifolium (Narrow-Leaved Mountain-Mint) |
 Pycnanthemum virginianum (Virginia Mountain-Mint) |
 Pyrola elliptica (Shinleaf) |
 Pyrularia pubera (Buffalo Nut) |
 Quercus imbricaria (Shingle Oak) |
 Quercus palustris (Pin Oak) |
 Quercus prinoides (Dwarf Oak) |
 Quercus rubra (Red Oak) |
 Ranunculus abortivus (Kidneyleaf Buttercup) |
 Ranunculus ambigens (Water-Plantain Spearwort) |
 Ranunculus aquatilis (White Water-Buttercup) |
 Ranunculus flabellaris (Yellow Water-Buttercup) |
 Ranunculus hispidus var. hispidus (Hispid Buttercup) |
 Ranunculus hispidus var. nitidus (Swamp Buttercup) |