 Morella pensylvanica (Northern Bayberry) |
 Morus species (Mulberry) |
 Muhlenbergia schreberi (Nimblewill) |
 Myosotis laxa (Small Forget-Me-Not) |
 Myriophyllum species (Water-Milfoil) |
 Najas species (Naiad) |
 Nelumbo lutea (American Lotus) |
 Neottia bifolia (Southern Twayblade) |
 Neottia cordata (Heart-Leaved Twayblade) |
 Nuphar species (Yellow Pond-Lily) |
 Nuphar species (Yellow Pond-Lily) - Reddish Flower |
 Nymphaea odorata (Fragrant Water-Lily) |
 Nymphaea odorata (Fragrant Water-Lily) - Pink Flower |
 Nyssa sylvatica (Black Gum) |
 Obolaria virginica (Virginia Pennywort) |
 Oclemena acuminata (Whorled Wood Aster) |
 Oenothera biennis (Common Evening-Primrose) |
 Oenothera biennis (Common Evening-Primrose) - Large Cluster |
 Oenothera fruticosa (Narrow-Leaved Sundrops) |
 Oenothera gaura (Biennial Gaura) |
 Oenothera perennis (Small Sundrops) |
 Opuntia humifusa (Prickly-Pear Cactus) |
 Orbexilum onobrychis (Sainfoin) |
 Orobanche uniflora (One-Flowered Cancer-Root) |
 Orontium aquaticum (Golden Club) |
 Osmorhiza species (Aniseroot) |
 Ostrya virginiana (Hornbeam) |
 Oxalis grandis (Large Yellow Wood-Sorrel) |
 Oxalis montana (Mountain Wood-Sorrel) |
 Oxalis violacea (Violet Wood-Sorrel) |
 Oxypolis rigidior (Cowbane) |
 Packera aurea (Golden Ragwort) |
 Packera aurea (Golden Ragwort) - Flower Buds |
 Packera glabella (Butterweed) |
 Packera obovata (Round-Leaved Ragwort) |
 Panax quinquefolius (American Ginseng) |
 Panax trifolius (Dwarf Ginseng) |
 Panicum capillare (Old Witch Grass) |
 Panicum dichotomiflorum (Fall Panic Grass) |
 Panicum virgatum (Switch Grass) |
 Parietaria pensylvanica (Pennsylvania Pellitory) |
 Parnassia glauca (Grass-of-Parnassus) |
 Paronychia canadensis (Forked Nailwort) |
 Parthenocissus quinquefolia (Virginia Creeper) |
 Paspalum laeve (Field Bead Grass) |
 Pedicularis canadensis (Wood Betony) |
 Pedicularis lanceolata (Swamp Lousewort) |
 Peltandra virginica (Arrow Arum) |
 Penstemon digitalis (Foxglove Beardtongue) |
 Penstemon digitalis (Foxglove Beardtongue) - Close View |