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Index by Common Names

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Oak, Red
Quercus rubra
Onion, Ornamental
Allium giganteum
Oak, Scarlet
Quercus coccinea
Onion, Prairie
Allium stellatum
Oak, Scrub
Quercus ilicifolia
Onion, Sea
Urginea maritima
Oak, Scrub
Quercus macrocarpa
Onion, Spring
Allium tricoccum
Oak, Turbinella
Quercus turbinella
Onion, Tapertip
Allium acuminatum
Oak, Turkey
Quercus cerris
Onion, Tumbleweed
Allium schubertii
Oak, Turkey
Quercus ilicifolia
Opuhi Uteute
Alpinia purpurata
Oak, Water
Quercus nigra
Opuhi Uteute
Alpinia purpurata cv. ‘Tahitian Ginger’
Oak, White
Quercus alba
Opuntia, Wolf’s
Cylindropuntia wolfii
Oak, Yellow
Quercus velutina
Orange Bolete
Leccinum aurantiacum
Oak-leach, Northern
Aureolaria pedicularia
Orange Daylily
Hemerocallis fulva
Oakleaf Hydrangea
Hydrangea quercifolia
Orange Fiddleneck
Amsinckia menziesii var. intermedia
Oakmoss, Boreal
Evernia mesomorpha
Orange Grass
Hypericum gentianoides
Oat, Wild
Avena fatua
Orange Hawkweed
Hieracium aurantiacum
Oats, Wild
Uvularia sessilifolia
Orange Jelly Fungus
Dacrymyces palmatus
Obedient Plant
Physostegia virginiana
Orange Milkweed
Asclepias tuberosa
Oblong-leaved Sundew
Drosera intermedia
Orange Plume Flower
Justicia spicigera
Oceana Blue Sage
Salvia patens ‘Salsyll’
Orange, Mandarin
Citrus reticulata ‘Dancy’
Oceanblue Morning Glory
Ipomoea indica
Orange, Mock
Philadelphus cv. Minnesota
Oconee Bells
Shortia galacifolia
Orange, Sour
Citrus ×aurantium ssp. aurantium
Oconee-bells
Shortia galacifolia
Orchard Grass
Dactylis glomerata
Ocotillo
Fouquieria splendens
Orchid
Doritaenopsis ‘OX Gold Orange’
Ocotillo, Madagascar
Alluaudia procera
Orchid
Oncostele ‘Golden Red Star’
Octopus Agave
Agave vilmoriniana
Orchid
Dendrobium
Octopus Cactus
Stenocereus alamosensis
Orchid
Cattleya hybrida
Old Maid’s Bonnets
Lupinus perennis
Orchid
Brassidium ‘Miami’
Old Man Cactus
Cephalocereus senilis
Orchid
Epidendrum ‘Miura Valley’
Old Man Cactus
Opuntia polyacantha var. erinacea
Orchid Cactus
Disocactus ackermannii
Old Man Cactus
Pachycereus schottii
Orchid, Corsage
Cattlianthe ‘Gorekrest’
Old Man Palm
Coccothrinax crinita
Orchid, Corsage
Cattleya trianae
Old Man of Mexico
Cephalocereus senilis
Orchid, Crane-fly
Tipularia discolor
Old Man of the Woods
Strobilomyces strobilaceus
Orchid, Jewel
Ludisia discolor
Old Man's Whiskers
Geum triflorum
Orchid, Lei
Dendrobium ‘Pegasus’
Old Man’s Beard
Clematis virginiana
Orchid, Moth
Phalaenopsis sp.
Old Man’s Pepper
Achillea millefolium
Orchid, Puttyroot
Aplectrum hyemale
Old Man’s Whiskers
Geum triflorum
Orchis, Showy
Galearis spectabilis
Oldfield Clover
Trifolium arvense
Orcutt’s Aster
Xylorhiza orcuttii
Oldfield Pine
Pinus taeda
Orcutt’s Woody Aster
Xylorhiza orcuttii
Oldham’s Bamboo
Bambusa oldhamii
Oregano
Origanum laevigatum ‘Herrenhausen’
Oleander
Nerium oleander
Oregano, Golden
Origanum vulgare ‘Aureum’
Olive, Autumn
Elaeagnus umbellata
Oregano, Ornamental
Origanum ‘Kent Beauty’
Olive, Black
Bucida molinetii
Oregon Grape
Mahonia aquifolium
Olive, Desert
Forestiera pubescens var. neomexicana
Oregon Grape
Mahonia repens
Olive, Dwarf
Olea europaea ‘Little Ollie’
Oregon-grape, Creeping
Mahonia repens
Olive, Russian
Elaeagnus angustifolia
Organ Pipe Cactus
Pachycereus marginatus
One-flowered Cancer-root
Orobanche uniflora
Oriental Bittersweet
Celastrus orbiculatus
Oneseed Juniper
Juniperus monosperma
Oriental Lady’s Thumb
Polygonum cespitosum
Onion, Bog
Arisaema triphyllum
Oriental Lily
Lilium ‘Star Gazer’
Onion, Hooker’s
Allium acuminatum
Oriental arbor-vitae
Platycladus orientalis
Onion, Nodding
Allium cernuum
Ornamental Bitter Orange
Citrus ×aurantium ssp. aurantium