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Scientific Name Common Name(s) Plant Category Image
Oxalis montana Common wood sorrel, Sourgrass Poisonous Plants, Wildflowers
Oxalis stricta L. Common yellow woodsorrel, Lemon clover, Pickle plant, Sourgrass, Yellow woodsorrel Annuals, Perennials, Wildflowers
Oxalis violacea Violet wood sorrel Poisonous Plants, Wildflowers
Oxydendrum arboreum Lily of the valley tree, Sorrel tree, Sourwood Native Plants, Trees
Oxypetalum caeruleum = Tweedia caerulea Tweedia Perennials
Pachysandra procumbens Allegheny spurge Wildflowers
Pachysandra terminalis Pachysandra Groundcover
Paeonia hybrids Peony Perennials
Pandanus tectorius Pandan, Screw pine Perennials, Trees
Pandorea pandorana Pandora vine, Wonga-wonga vine Vines
Panicum amarum Bitter panicgrass, Bitter panicum, Bitter switchgrass , Switchgrass Ornamental Grass, Perennials
Panicum virgatum Panic grass, Switch grass Native Plants, Ornamental Grass, Perennials
Panicum virgatum 'Cloud Nine' Tall switch grass Ornamental Grass
Panicum virgatum 'Heavy Metal' Heavy Metal blue switch grass Ornamental Grass
Papaver somniferum Opium poppy, common poppy Perennials, Poisonous Plants
Papaver spp. Poppy Perennials
Parnassia asarifolia Grass-of-parnassus, Kidney-leaf grass-of-parnassus Wildflowers
Paronychia kapela Nailwort Groundcover
Parrotia persica Persian parrotia Trees
Parrotiopsis jacquemontiana Shrubs
Parthenium integrifolium American feverfew, Wild quinine Perennials, Wildflowers
Parthenocissus heptaphylla Vines
Parthenocissus quinquefolia Binewood, Virginia creeper Groundcover, Native Plants, Poisonous Plants, Vines
Parthenocissus tricuspidata Boston ivy, Japanese creeper Vines
Passiflora incarnata Maypop, Passion flower Edible Plants, Native Plants, Perennials, Vines, Wildflowers
Passiflora lutea Native Plants, Perennials, Vines
Pastinaca sativa Wild parsnip Poisonous Plants
Paulownia tomentosa Empress tree, Princess tree Trees
Paxillus involutus Naked Brimcap, Poison Paxillus Poisonous Plants
Pedicularis canadensis Lousewort, Wood betony Wildflowers
Pedilanthus tithymaloides Japanese poinsettia, devil's-backbone, redbird flower, slipper flower Poisonous Plants
Pelargonium peltatum Ivy geranium Annuals, Poisonous Plants
Pelargonium spp. Geranium, Scented geranium Edible Plants, Herbs, Poisonous Plants
Pelargonium x hortorum Geranium Annuals, Poisonous Plants
Pellaea falcata Sickle fern Ferns
Pennisetum alopecroides 'Hamelin' Hamelin dwarf fountain grass Ornamental Grass
Pennisetum alopecroides 'Moudry' Moudry fountain grass Ornamental Grass
Pennisetum alopecuroides Fountain grass Groundcover, Ornamental Grass
Pennisetum orientale Oriental fountain grass Ornamental Grass
Pennisetum setaceum Annual fountain grass, Crimson fountain grass, Dwarf red fountain grass, Purple fountain grass Annuals, Ornamental Grass
Penstemon australis Pink Beardtongue Native Plants
Penstemon canescens Beard-tongue, Penstemon Herbs, Native Plants, Perennials, Wildflowers
Penstemon cobaea Cobaea beardtongue Wildflowers
Penstemon digitalis Foxglove beardtongue, White beardtongue Native Plants, Perennials, Wildflowers
Penstemon laevigatus Eastern beardtongue, Eastern smooth beardtongue, Smooth beardtongue Herbs, Native Plants, Perennials, Wildflowers
Penstemon smallii Beard tongue Herbs, Native Plants, Perennials, Wildflowers
Penstemon spp. Bearded tongue Perennials
Pentas lanceolata Pentas, Star cluster, Egyptian Starcluster Annuals
Peperomia argyreia Watermelon peperomia Groundcover, Perennials
Peperomia caperata Emerald ripple peperomia, Emerald ripple pepper, Ivy-leaf peperomia Groundcover, Perennials