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Common Names—O
Common Name Scientific Name
Oak Mistletoe Phoradendron villosum
Oak Moss Evernia prunastri
Oak, Cork Quercus suber
Oak, English Quercus robur
Oak, European Turkey Quercus cerris
Oak, Live Quercus virginana
Oak, Macedonian Quercus macedonica
Oak, Poison Toxicodendron diversilobum
Oak, Scrub Quercus berberidifolia
Oak, White Quercus alba
Oak-leaf Hydrangea Hydrangea quercifolia
Oakmoss Evernia prunastri
Oats Avena sativa
Oats, Wild Avena sativa
Oats, Wild Avena fatua
Obedient Plant Physostegia virginiana
Oblong-leaved Sundew Drosera intermedia
Ohelo Vaccinium reticulatum
Ohio Buckeye Aesculus glabra
Ohio Spiderwort Tradescantia ohiensis
Oil Palm, American Elaeis oleifera
Okra Abelmoschus esculentus
Old Plainsman; Hymenopappus Hymenopappus scabiosaeus
Oleander Nerium oleander
Oleander, Yellow Thevetia peruviana
Olibanum Boswellia sacra
Olibanum, Indian Boswellia serrata
Olive, Fragrant Osmanthus fragrans
Olive leaf Olea europaea
Olive, Tea Osmanthus fragrans
Olive tree Olea europaea
Olives Olea europaea
Olympic Mullein Verbascum olympicum
One-flowered Wintergreen Moneses uniflora
One-seeded Hawthorn Crataegus monogyna
One-seeded Juniper Juniperus monosperma
Onions Allium cepa
Onion, Drummond's Allium drummondii
Onion, Nodding Allium cernuum
Onion, Nodding Pink Allium cernuum
Opium Poppy Papaver somniferum
Orange, Bitter Citrus aurantium
Orange, Hardy Citrus trifoliata
Orange Hawkweed Hieracium aurantiacum
Orange Honeysuckle Lonicera ciliosa
Orange Jessamine Murraya paniculata
Orange, Mandarin Citrus reticulata
Orange, Marmalade Citrus aurantium
Orange, Osage Maclura pomifera
Orange Puccoon Lithospermum canescens
Orange, Seville Citrus aurantium
Orange, Sour Citrus aurantium
Orange, Trifoliate Poncirus trifoliata
Oranges Citrus sinensis
Orchid, Bamboo Arundina graminifolia
Orchid, Cactus Epiphyllum oxypetalum
Hooker's Orchid Cactus Epiphyllum hookeri
Orchid, Green Fringed Platanthera lacera
Orchid, Fragrant Gymnadenia conopsea
Orchid, Heart-leaved Twayblade Listera cordata
Orchid, Helleborine Epicactis helleborine
Orchid, Ragged Fringed Platanthera lacera
Orchid, Ram's Head Cypripedium arietinum
Orchid, Small Purple Fringed Platanthera psycodes
Orchid, Snakehead Pogonia ophioglossoides
Orchid, Tall White Bog Platanthera dilata
Oregano Origanum vulgare
Oregano, Greek Origanum vulgare subsp. hirtum
Oregano, Mexican Lippia graveolens
Oregon Grape, Creeping Mahonia repens (Berberis aquifolium var. repens)
Oregon Grape, Dull Mahonia nervosa
Oregon Grape Longleaf Mahonia nervosa
Oregon Grape Root Mahonia aquifolium
Oriental Bittersweet Celastrus orbiculatus
Oriental Cattail Typha orientalis
Oriental Hellebore Helleborus orientalis
Oriental Knight's-spur Consolida orientalis
Oriental, Lady's Thumb Polygonum cespitosum
Oriental Larkspur Consolida orientalis
Oriental Virgin's Bower Clematis orientalis
Orlaya, Large-flowered Orlaya grandiflora
Ornamental Poppy Papaver spp.
Ornamental Kale Brassica oleracea
Orris Root Iris germanica
Orthosiphon Orthosiphon stamineus, O. aristata
Ortiga Urera laciniata
Osage Orange Maclura pomifera
Osha Ligusticum porteri
Osmanthus, Sweet Osmanthus fragrans
Ostrich Plume Alpinia purpurata
Oswego Tea Monarda didyma
Ox-eye Daisy Leucanthemum vulgare
Ox-knee Achyranthes bidentata
Ozark Chinquapin; Ozark Chestnut Castanea pumila var. ozarkensis, Castanea ozarkensis
Ozark Leatherwood Dirca decipiens
Ozark Wake Robin Trillium pusillum var. ozarkanum
Ozark Witch Hazel Hamamelis vernalis