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Scientific Name Common Name(s) Plant Category Image
Ophiopogon japonicus 'Nana' Dwarf mondo grass Groundcover
Opuntia spp. Rabbit ears cactus, prickly pear cactus Poisonous Plants
Origanum majorana Sweet marjoram Edible Plants, Herbs
Origanum vulgare Oregano Edible Plants, Herbs
Ornithogalum Star of Bethlehem Summer Bulbs
Ornithogalum umbellatum Star of Bethlehem Perennial Bulbs, Spring Bulbs
Ornithogalum umbellatum, O. thrysoides Ornithogalum, Star-of-Bethlehem Poisonous Plants
Orontium aquaticum Golden club Poisonous Plants, Water Garden, Wildflowers
Osmanthus americanus Devilwood, Wild olive Native Plants, Shrubs, Trees
Osmanthus delavayi Delavay teaolive Shrubs
Osmanthus fragrans Fragrant tea olive, Sweet osmanthus Shrubs
Osmanthus heterophyllus False holly, Holly osmanthus, Holly tea olive Shrubs
Osmanthus x burkwoodii Burkwood osmanthus Shrubs
Osmanthus x fortunei Fortune's osmanthus, Fortune's tea olive Shrubs
Osmunda cinnamomea Cinnamon fern Ferns, Native Plants
Osmunda claytoniana Clayton's fern, Interrupted fern Ferns
Osmunda regalis Flowering fern, Royal fern Ferns, Native Plants
Ostrya virginiana Eastern hop hornbeam, Hop horn beam, Hop hornbeam Native Plants, Trees
Oxalis Clover, Good luck plant, Lucky clover, Oxalis, Shamrock, Wood-sorrel Annuals, Perennials, Poisonous Plants, Summer Bulbs, Wildflowers
Oxalis corniculata L. Creeping woodsorrel Annuals, Perennials, Wildflowers
Oxalis crassipes Oxalis Perennials, Poisonous Plants
Oxalis grandis Large yellow wood-sorrel, Oxalis, Sourgrass Poisonous Plants, Wildflowers
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 Wild quinine Wildflowers
Parthenocissus heptaphylla Vines
Parthenocissus quinquefolia Binewood, Virginia creeper Groundcover, Native Plants, Poisonous Plants, Vines
Parthenocissus tricuspidata Boston ivy, Japanese creeper Vines
Passiflora incarnata Maypops, Passion flower Edible Plants, Native Plants, Perennials, Vines, Wildflowers
Pastinaca sativa Wild parsnip Poisonous Plants
Paulownia tomentosa Empress tree, Princess tree Trees
Paxillus involutus Naked Brimcap, Poison Paxillus Poisonous Plants