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2,033 Plants, page 1 of 2
- O Solo Mio Daylily: Hemerocallis ’O Solo Mio’
- O’brien’s Star Orchid: Epidendrum x O’brienianum
- O’cool Intermediate Bearded Iris: Iris ’O’Cool’
- O’henry Peach: Prunus persica ’O’Henry’
- O’kennon’s Hawthorn: Crataegus okennonii
- O’neal Rabbiteye Blueberry: Vaccinium ashei ’O’Neal’
- O’neill’s Sedge: Carex oneillii, Carex × oneillii
- O’o Moa: Psilotum complanatum
- O’ree Zenobia: Zenobia pulverulenta ’O’ Ree’
- O-Shiriomidoro: Hormiscia wormskioldii
- Oahu Aiea: Nothocestrum peltatum
- Oahu Beggarticks: Bidens populifolia
- Oahu Chewstick: Gouania vitifolia
- Oahu Clermontia: Clermontia oblongifolia, Clermontia oblongifolia brevipes, Clermontia oblongifolia mauiensis, Clermontia oblongifolia oblongifolia
- Oahu Cowpea: Vigna owahuensis
- Oahu Cyanea: Cyanea hardyi
- Oahu Cyrtandra: Cyrtandra laxiflora
- Oahu Dock: Rumex albescens
- Oahu False Ohelo: Wikstroemia oahuensis, Wikstroemia oahuensis (Gray) Rock var. oahuensis (Gray) Rock
- Oahu Flatsedge: Cyperus hypochlorus, Cyperus hypochlorus Hbd. var. brevior Kükenth., Cyperus hypochlorus Hbd. var. hypochlorus Hbd.
- Oahu Gardenia: Gardenia mannii
- Oahu Kihifern: Adenophorus oahuensis
- Oahu Lobelia: Lobelia oahuensis
- Oahu Lovegrass: Eragrostis paupera, Eragrostis paupera macradenia var. macradenia
- Oahu Melicope: Melicope oahuensis
- Oahu Mirrorplant: Coprosma longifolia
- Oahu Pelea: Melicope oahuensis
- Oahu Peperomia: Peperomia oahuensis
- Oahu Phyllostegia: Phyllostegia lantanoides
- Oahu Pilo Kea: Platydesma cornuta
- Oahu Prickly-Ash: Zanthoxylum oahuense
- Oahu Pricklyash: Zanthoxylum oahuense
- Oahu Riverhemp: Sesbania tomentosa
- Oahu Rollandia: Cyanea humboldtiana
- Oahu Sandmat: Chamaesyce deppeana
- Oahu Schiedea: Schiedea kaalae
- Oahu Sedge: Carex wahuensis, Carex wahuensis wahuensis
- Oahu Stenogyne: Stenogyne kanehoana
- Oahu Tetramolopium: Tetramolopium tenerrimum
- Oahu Tomato Lycopersicon Lycopersicum: Lycopersicon lycopersicum ’Oahu’
- Oahu Violet: Viola oahuensis
- Oahu Woodrush: Luzula picta var. limosa
- Oahu Wormwood: Artemisia australis
- Oainted Buckeye: Aesculus sylvatica
- Oak: Quercus alba ’Brush Creek’, Quercus alba ’Gatton Grave’, Quercus alba ’Linclon’, Quercus beaumontiana, Quercus bimundorum, Quercus burnetensis, Quercus bushii, Quercus caduca, Quercus capesii, Quercus comptoniae, Quercus cravenensis, Quercus demareei, Quercus diversiloba, Quercus dolicholepis, Quercus exacta, Quercus faginea, Quercus fernowii, Quercus filialis, Quercus franchetii, Quercus guadalupensis, Quercus harbisonii, Quercus hastingsii, Quercus heterophylla, Quercus howellii, Quercus humidicola, Quercus incomita, Quercus inconstans, Quercus insignis, Quercus introgressa, Quercus ithaburensis, Quercus joorii, Quercus lamellosa, Quercus lancifolia, Quercus leana, Quercus lobata, Quercus ludoviciana, Quercus macnabiana, Quercus megaleia, Quercus mutabilis, Quercus neopalmeri, Quercus neotharpii, Quercus nessiana, Quercus nuttallii ’New Madrid’, Quercus organensis, Quercus oviedoensis, Quercus palaeolithicola, Quercus pauciloba, Quercus podophylla, Quercus rotundifolia, Quercus runcinata, Quercus saulii, Quercus schochiana, Quercus schottkyana, Quercus schuettei, Quercus serrata, Quercus stelloides, Quercus sterilis, Quercus subfalcata, Quercus subintegra, Quercus substellata, Quercus tharpii, Quercus tristis, Quercus uxoris, Quercus vaga, Quercus velutina ’Oakridge Walker’, Quercus venulosa, Quercus x bebbiana’Taco’, Quercus × deamii, Quercus × fernowii, Quercus x reifii, Quercus × saulii, Quercus x saulii’Atlas’, Quercus x sternbergii, Quercus x warei’Chimney Fire’, Quercus x warei’Windcandle’
- Oak Creek Ragwort: Packera quercetorum
- Oak Creek Triplet-Lily: Triteleia lemmoniae
- Oak Creek Triteleia: Triteleia lemmoniae
- Oak Fern: Gymnocarpium dryopteris
- Oak Leaf Basket Fern: Drynaria quercifolia
- Oak Leaf Creeping Fig: Ficus pumila ’Quercifolia’
- Oak Leaf Datura: Datura quercifolia
- Oak Leaf Fern: Quercifilix zeylanica
- Oak Leaf Hydrangea: Hydrangea quercifolia
- Oak Leaf Ivy: Cissus rhombifolia
- Oak Leaf Philodendron: Philodendron quercifolia
- Oak Leaf" Red Holly: Ilex x ’Conaf’
- Oak Mistletoe: Phoradendron leucarpum, Phoradendron villosum
- Oak Ridge Lupine: Lupinus diffusus
- Oak-Leaf Fleabane: Erigeron quercifolius
- Oak-Leaf Goosefoot: Chenopodium glaucum
- Oak-Leaf Grevillea: Grevillea quercifolia
- Oak-leaf Nemophila: Nemophila parviflora var. quercifolia (Eastw.) Chandler
- Oak-Leaved Geranium: Pelargonium quercifolium, Pelargonium quercifolium ’Fair Ellen’, Pelargonium quercifolium ’Giganteum’, Pelargonium quercifolium ’Staghorn Oak’, Pelargonium quercifolium ’Village Hill Oak’
- Oak-Leaved Papaya: Carica quercifolia
- Oakbelt Daisy: Erigeron neomexicanus
- Oakes Evening Primrose: Oenothera oakesiana
- Oakes Love Daylily: Hemerocallis ’Oakes Love’
- Oakes’ Evening-Primrose: Oenothera oakesiana
- Oakes’ Eyebright: Euphrasia oakesii
- Oakes’ Pondweed: Potamogeton oakesianus
- Oakfern: Gymnocarpium achriosporum
- Oakforest Woodrush: Luzula luzuloides, Luzula luzuloides cuprina
- Oakington Jewel Alum Root Heuchera: Heuchera ’Oakington Jewel’
- Oakland Mariposa Lily: Calochortus umbellatus
- Oakland Star Tulip: Calochortus umbellatus
- Oakleaf Beech: Fagus sylvatica ’Quercifolia’
- Oakleaf Carica: Carica quercifolia
- Oakleaf Cyanea: Cyanea quercifolia
- Oakleaf Feltbush: Kalanchoe beharensis ’Oakleaf’
- Oakleaf Fleabane: Erigeron quercifolius
- Oakleaf Foamflower: Tiarella cordifolia var. collina’Oakleaf’
- Oakleaf Garden Scented Geranium: Pelargonium panduriforme
- Oakleaf Geranium: Pelargonium quercifolium
- Oakleaf Goosefoot: Chenopodium glaucum
- Oakleaf Holly: Ilex x ’Oakleaf’
- Oakleaf Hydrangea: Hydrangea quercifolia, Hydrangea quercifolia ’Alice’, Hydrangea quercifolia ’Amethyst’, Hydrangea quercifolia ’Applause’, Hydrangea quercifolia ’Back Porch’, Hydrangea quercifolia ’Burgundy’, Hydrangea quercifolia ’Camelot’, Hydrangea quercifolia ’Cloud Nine’, Hydrangea quercifolia ’Ellen Huff’, Hydrangea quercifolia ’Gloster Form’, Hydrangea quercifolia ’Harmony’, Hydrangea quercifolia ’Joe McDaniel’, Hydrangea quercifolia ’John Wayne’, Hydrangea quercifolia ’Late Hand’, Hydrangea quercifolia ’Luverne Pink’, Hydrangea quercifolia ’Lynn Lowery’, Hydrangea quercifolia ’Montmorenci Rose’, Hydrangea quercifolia ’Patio Pink’, Hydrangea quercifolia ’Pee Wee’, Hydrangea quercifolia ’Picnic Hill’, Hydrangea quercifolia ’Roanoke’, Hydrangea quercifolia ’Semmes Beauty’, Hydrangea quercifolia ’Shannon’, Hydrangea quercifolia ’Snowflake’, Hydrangea quercifolia ’Snow Giant’, Hydrangea quercifolia ’Snow Queen’, Hydrangea quercifolia ’Stardust’, Hydrangea quercifolia ’Tennessee Clone’, Hydrangea quercifolia ’Vaughn’s Lillie’, Hydrangea quercifolia ’Wade Mahlke’
- Oakleaf Lettuce Lactuca Sativa: Lactuca sativa ’Oakleaf’
- Oakleaf Mountain Ash: Sorbus hybrida, Malus sorbus, Sorbus × thuringiaca ’Fastigiata’
- Oakview Hosta: Hosta ’Oakview’
- Oakwoods Dalea: Dalea versicolor
- Oakwoods Dewberry: Rubus largus
- Oakwoods Pony-Foot: Dichondra recurvata
- Oakwoods Ponysfoot: Dichondra recurvata
- Oakwoods Prairie Clover: Dalea versicolor, Dalea versicolor var. sessilis
- Oakwoods Prairie-Clover: Dalea versicolor
- Oakwoods Prairieclover: Dalea versicolor
- Oasis Hummingbird: Rhodopis vesper
- Oat: Avena sativa
- Oat Brome: Bromus danthoniae
- Oatgrass: Arrhenatherum elatius, Avena fatua
- Oats: Avena sativa
- Oaxacan Palmetto: Sabal mexicana
- Oaxacan Tree Nolina: Nolina longifolia
- Oba Kusa Fuji: Vicia pseudo-orobus
- Obake Hybrid: Anthurium ’Kimi’, Anthurium ’Oshiro’, Anthurium ’Pearl’, Anthurium ’Rainbow’
- Obana-hanemo: Bryopsis hypnoides, Bryopsis hypnoides arbuscula, Bryopsis hypnoides lagunarum, Bryopsis hypnoides praelongata, Bryopsis hypnoides subnuda
- Obe: Elaeis guineensis
- Obediah Daylily: Hemerocallis ’Obediah’
- Obedience Daylily: Hemerocallis ’Obedience’
- Obedience Plant: Maranta arundinacea ’Variegata’
- Obedient Plant: Physostegia angustifolia, Physostegia pulchella, Physostegia virginiana, Physostegia virginiana ’Alba’, Physostegia virginiana (L.) Benth. ’Bouquet Rose’, Physostegia virginiana ’Crown of Snow’, Physostegia virginiana ’Miss Manners’, Physostegia virginiana ’Olympus Gold’, Physostegia virginiana praemorsa, Physostegia virginiana ’Red Beauty’, Physostegia virginiana ’Rose Crown’, Physostegia virginiana ’Rose Queen’, Physostegia virginiana Schneekrone, Physostegia virginiana ’Vivid’, Physostegia virginiana ’Pink Bouquet’
- Obedient-Plant: Physostegia virginiana, Physostegia virginiana ’Pink Bouquet’
- Obertshausen Daylily: Hemerocallis ’Obertshausen’
- Obinson’s Red Painted Daisy: Tanacetum coccineum ’Robinson’s Red’
- Oblique Maidenhair: Adiantum obliquum
- Oblique Seed Jackbean: Canavalia plagiosperma
- Oblique-Leaf Trumpets: Acleisanthes anisophylla
- Obliqueleaf Trumpets: Acleisanthes anisophylla
- Obliqueseeded Jackbean: Canavalia plagiosperma
- Oblong Bluecurls: Trichostema oblongum
- Oblong Bryum Moss: Bryum oblongum
- Oblong Bulrush: Schoenoplectus carinatus
- Oblong Leaf Alder: Alnus oblongifolia
- Oblong Lespedeza: Lespedeza oblongifolia
- Oblong Spurge: Euphorbia oblongata
- Oblong-Leaf Orache: Atriplex oblongifolia
- Oblong-Leaf Serviceberry: Amelanchier canadensis
- Oblong-Leaved Dyschoriste: Dyschoriste oblongifolia
- Oblong-Leaved Vanilla: Vanilla phaeantha
- Oblongfruit Serviceberry: Amelanchier bartramiana
- Oblongleaf Bahia: Platyschkuhria integrifolia
- Oblongleaf Bluebells: Mertensia oblongifolia
- Oblongleaf False Pennyroyal: Hedeoma oblongifolia
- Oblongleaf Orache: Atriplex oblongifolia
- Oblongleaf Snakeherb: Dyschoriste oblongifolia
- Oblongleaf Stonecrop: Sedum oblanceolatum
- Oblongleaf Twin Flower: Dyschoriste oblongifolia
- Obo Daylily: Hemerocallis ’Obo’
- Oboe Da Caccia Daylily: Hemerocallis ’Oboe Da Caccia’
- Oborozuki Sweet Flag: Acorus gramineus ’Oborozuki’
- Obovate Andreaea Moss: Andreaea obovata
- Obovate Beakgrain: Diarrhena obovata
- Obovate Coastal Juneberry: Amelanchier obovalis
- Obovate Marshallia: Marshallia obovata
- Obovate Melicope: Melicope obovata
- Obovate Milkweed: Asclepias obovata
- Obovateleaf Sundew: Drosera obovata
- Obregonita: Obregonia denegrii f. cristata, Obregonia denegrii var. prerovskyana
- Obriens Choice Tall Bearded Iris: Iris ’O’Brien’s Choice’
- Obscura Aureomarginata Hosta: Hosta ’Obscura Aureomarginata’
- Obscure Buttercup: Ranunculus triternatus
- Obscure Cat’s-Eye: Cryptantha ambigua
- Obscure Indian Paintbrush: Castilleja cryptantha
- Obscure Indian-Paintbrush: Castilleja cryptantha
- Obscure Morning-Glory: Ipomoea obscura
- Obscure Morningglory: Ipomoea obscura
- Obscure Phacelia: Phacelia inconspicua
- Obsessed Daylily: Hemerocallis ’Obsessed’
- Obsession Hosta: Hosta ’Obsession’
- Obsession In Red Daylily: Hemerocallis ’Obsession In Red’
- Obsidian Coral Bells: Heuchera ’Obsidian’
- Obsidian Daylily: Hemerocallis ’Obsidian’
- Obtuse Sedge: Carex obtusata
- Obtuse Tortula Moss: Tortula obtusissima
- Obtuseleaf Aspen Moss: Orthotrichum obtusifolium
- Obtuseleaf Desmatodon Moss: Desmatodon obtusifolius
- Obtuseleaf Fissidens Moss: Fissidens obtusifolius
- Obtuseleaf Pohlia Moss: Pohlia obtusifolia
- Obtuseleaf Schistidium Moss: Schistidium obtusifolium
- Obtuseleaf Scleropodium Moss: Scleropodium obtusifolium
- Obusa: Gelidium pacificum
- Obvious Pleasure Daylily: Hemerocallis ’Obvious Pleasure’
- Oca: Oxalis tuberosa
- Ocahui: Agave ocahui var. longifolia
- Ocala Blackberry: Rubus inferior
- Ocala Vetch: Vicia ocalensis
- Ocean Clouds Tall Bearded Iris: Iris ’Ocean Clouds’
- Ocean Ice Daylily: Hemerocallis ’Ocean Ice’
- Ocean Mist Daylily: Hemerocallis ’Ocean Mist’
- Ocean Pacific Tall Bearded Iris: Iris ’Ocean Pacific’
- Ocean Rain Daylily: Hemerocallis ’Ocean Rain’
- Ocean Spray: Holodiscus discolor
- Ocean Sunrise Daylily: Hemerocallis ’Ocean Sunrise’
- Ocean Wave Scented Geranium: Pelargonium ’Ocean Wave’
- Ocean Wave Southern Magnolia: Magnolia grandiflora ’Ocean Wave’
- Ocean Wind Daylily: Hemerocallis ’Ocean Wind’
- Oceanblue Larkspur: Delphinium parishii subglobosum
- Oceanblue Morning Glory: Ipomoea indica
- Oceanblue Morning-Glory: Ipomoea indica
- Oceanblue Morningglory: Ipomoea indica
- Oceanblue Phacelia: Phacelia ranunculacea
- Oceanside Daylily: Hemerocallis ’Oceanside’
- Oceanspray: Holodiscus discolor
- Ocellated Humboldt Lily: Lilium humboldtii ocellatum
- Ocellated Sand-eel: Calliergonella cuspidatum
- Ocelot Tall Bearded Iris: Iris ’Ocelot’
- Ocher-Flowered Wild-Buckwheat: Eriogonum ochrocephalum
- Ocherflower Buckwheat: Eriogonum ochrocephalum
- Ochraurea Spuria Iri: Iris ’Ochraurea’
- Ochre Clematis: Clematis ochroleuca
- Ocmulgee Skullcap: Scutellaria ocmulgee
- Oconee Azalea: Rhododendron flammeum
- Oconee Bells: Shortia galacifolia, Shortia galacifolia var. galacifolia, Shortia x ’Leona’
- Oconne Bells: Shortia galaccifolia
- Ocote: Gochnatia hypoleuca, Gochnatia hypoleuca ’Spank’
- Ocote Pine: Pinus oocarpa
- Ocotillo: Fouquieria splendens, Fouquieria splendens splendens
- Ocracoke Daylily: Hemerocallis ’Ocracoke’
- Ocre-band Wrasse: Meteorium ancistrodes
- Octavia Rumbley Daylily: Hemerocallis ’Octavia Rumbley’
- Octavian Ballerina Daylily: Hemerocallis ’Octavian Ballerina’
- Octavian Cherry Doll Daylily: Hemerocallis ’Octavian Cherry Doll’
- Octavian Exotic Marble Daylily: Hemerocallis ’Octavian Exotic Marble’
- Octavian Glow Daylily: Hemerocallis ’Octavian Glow’
- Octavian Marble Model Daylily: Hemerocallis ’Octavian Marble Model’
- Octavian Marble Ring Daylily: Hemerocallis ’Octavian Marble Ring’
- Octavian Orchid Daylily: Hemerocallis ’Octavian Orchid’
- Octavian Pink Lady Daylily: Hemerocallis ’Octavian Pink Lady’
- Octavian Princess Daylily: Hemerocallis ’Octavian Princess’
- Octavian Scroll Daylily: Hemerocallis ’Octavian Scroll’
- Octavio Tomato Lycopersicon Lycopersicum: Lycopersicon lycopersicum ’Octavio’
- October Blaze Tall Bearded Iris: Iris ’October Blaze’
- October Daphne: Sedum sieboldii, Sedum sieboldii f. variegatum, Sedum sieboldii ’Mediovariegatum’
- October Daphne Stonecrop: Sedum sieboldii
- October Flower: Polygonella polygama
- October Glory Red Maple: Acer rubrum ’October Glory’
- October Gold Daylily: Hemerocallis ’October Gold’
- October Hibiscus: Hibiscus sabdariffa, Hibiscus sabdariffa ’Jamaican Cocktail’
- October Ladies’-Tresses: Spiranthes ovalis
- October Ladiestresses: Spiranthes ovalis
- October Rose: Hibiscus radiatus
- October Skies Hosta: Hosta ’October Skies’
- October Sky Tall Bearded Iris: Iris ’October Sky’
- October Splendor Border Bearded Iri: Iris ’October Splendor’
- October Tall Bearded Iris: Iris ’October’
- Octoblepharum Moss: Octoblepharum albidum
- Octopus Agave: Agave vilmoriniana
- Octopus Arms: Monadenium ellenbeckii
- Octopus Cactus: Stenocereus alamosensis
- Octopus Fern: Zygophlebia sectifrons
- Octopus Plant: Didierea trollii
- Octopus Tree: Didierea madagascariensis, Schefflera actinophylla
- Oculus-Draconis Dragoneye Pine: Pinus densiflora ’Oculus-draconis’
- Odd Ball Daylily: Hemerocallis ’Odd Ball’
- Odd But Grand Daylily: Hemerocallis ’Odd But Grand’
- Odd English Ivy: Hedera helix ’Design’
- Odd Fellow Daylily: Hemerocallis ’Odd Fellow’
- Odd Lot Daylily: Hemerocallis ’Odd Lot’
- Odd One Daylily: Hemerocallis ’Odd One’
- Odd-Leaved Orchid: Aporostylis bifolia
- Oddball Hosta: Hosta ’Oddball’
- Oddleaf Oak: Quercus heterophylla
- Oddsepal Knotweed: Polygonum heterosepalum
- Ode Daylily: Hemerocallis ’Ode’
- Ode De Nana Daylily: Hemerocallis ’Ode De Nana’
- Ode To Spring Daylily: Hemerocallis ’Ode To Spring’
- Ode To Summer Daylily: Hemerocallis ’Ode To Summer’
- Odessa Tomato Lycopersicon Lycopersicum: Lycopersicon lycopersicum ’Odessa’
- Odieri: Eriosyce odieri
- Odontadenia: Odontadenia macrantha
- Odontioda: Odontioda ’Dalmar X Cristor’, Odontioda ’Enchansen X Ile de Re’
- Odontocidium Jungle Monarch: Odontocidium ’Everglades’
- Odontocidium Wildcat: Odontocidium ’Yellow Butterfly’
- Odontoglossum Margarete Holm: Odontoglossum ’Larkspur’
- Odontoglossum Violetta Von Holm: Odontoglossum ’Bianca’
- Odontonema: Odontonema cuspidatum ’Gray White’
- Odontonia: Odontonia ’Mouliere X Lippestern’
- Odontonia Yellow Parade: Odontonia ’Alpine’
- Odontophorus: Odontophorus marlothii, Odontophorus nanus
- Odorless Bayberry: Morella inodora
- Oduma: Gossweilerodendron joveri
- Oeder’s Lousewort: Pedicularis oederi
- Oeder’s Plagiopus Moss: Plagiopus oederiana
- Oehme Palm Sedge: Carex muskingumensis ’Oehme’
- Oering: Callerya vasta
- Oersted’s Atrichum Moss: Atrichum oerstedianum
- Oersted’s Campylopus Moss: Campylopus oerstedianus
- Oertel’s Rose Common Yarrow: Achillea millefolium ’Oertel’s Rose’
- Oeuf De Poule: Anadenanthera peregrina
- Oeverwallaba: Eperua rubiginosa
- Of a Different Stripe Daylily: Hemerocallis ’Of A Different Stripe’
- Of All Things Daylily: Hemerocallis ’Of All Things’
- Ofai: Sesbania grandiflora
- Ofallon Daylily: Hemerocallis ’O’Fallon’
- Off Broadway Tall Bearded Iris: Iris ’Off Broadway’
- Off The Wall Daylily: Hemerocallis ’Off The Wall’
- Off We Go Daylily: Hemerocallis ’Off We Go’
- Offa Daylily: Hemerocallis ’Offa’
- Offas Dike Daylily: Hemerocallis ’Offas Dike’
- Offenham Tall Bearded Iris: Iris ’Offenham’
- Officer And Gentleman Daylily: Hemerocallis ’Officer And Gentleman’
- Official Burnet: Sanguisorba officinalis
- Official Curse Daylily: Hemerocallis ’Official Curse’
- Officiers-Kwast: Calliandra surinamensis
- Oga Hosta: Hosta ’Oga’
- Ogden’s Pondweed: Potamogeton ogdenii
- Ogeechee Moon Daylily: Hemerocallis ’Ogeechee Moon’
- Ogeechee Tupelo: Nyssa ogeche
- Ogeechee Valley Daylily: Hemerocallis ’Ogeechee Valley’
- Ogiera: Eleutheranthera ruderalis
- Ogilvie Mountain Springbeauty: Claytonia ogilviensis
- Ogilvie Range Draba: Draba ogilviensis
- Ogilvie Range Whitlow-Grass: Draba ogilviensis
- Oglethorpe Oak: Quercus oglethorpensis
- Ogon Hime Hosta: Hosta ’Ogon Hime’
- Ogon Koba Hosta: Hosta ’Ogon Koba’
- Ogon Nishiki Japanese Star-Jasmine: Trachelospermum asiaticum ’Ogon Nishiki’
- Ogon Sagae Hosta: Hosta ’Ogon Sagae’
- Ogon Sweetflag: Acorus gramineus ’Ogon’
- Ogon Tachi Hosta: Hosta ’Ogon Tachi’
- Ogon Tsushima Hosta: Hosta ’Ogon Tsushima’
- Ogon Wogon Hosta: Hosta ’Ogon Wogon’
- Ogotoruk Creek Groundsel: Packera ogotorukensis
- Ogotoruk Creek Ragwort: Packera ogotorukensis
- Oguruma: Inula britannica var. chinensis
- Oh Babe Daylily: Hemerocallis ’Oh Babe’
- Oh Babe Tall Bearded Iris: Iris ’Oh Babe’
- Oh Baby Yes Daylily: Hemerocallis ’Oh Baby Yes’
- Oh Be Joyful Tall Bearded Iris: Iris ’Oh Be Joyful’
- Oh Danny Boy Daylily: Hemerocallis ’Oh Danny Boy’
- Oh Holy Spirit Daylily: Hemerocallis ’Oh Holy Spirit’
- Oh How Wonderful Daylily: Hemerocallis ’Oh How Wonderful’
- Oh Jamaica Tall Bearded Iris: Iris ’Oh Jamaica’
- Oh Jay Standard Dwarf Bearded Iri: Iris ’Oh Jay’
- Oh Jose Daylily: Hemerocallis ’Oh Jose’’
- Oh Matthew Matthew Daylily: Hemerocallis ’Oh Matthew Matthew’
- Oh My Heart Hosta: Hosta ’Oh My Heart’
- Oh My Papa Daylily: Hemerocallis ’Oh My Papa’
- Oh Nancy Daylily: Hemerocallis ’Oh Nancy’
- Oh Paul Daylily: Hemerocallis ’Oh Paul’
- Oh Perfect Love Daylily: Hemerocallis ’Oh Perfect Love’
- Oh Please Daylily: Hemerocallis ’Oh Please’
- Oh Sandy Daylily: Hemerocallis ’Oh Sandy’
- Oh Shenandoah Daylily: Hemerocallis ’Oh Shenandoah’
- Oh So Black Daylily: Hemerocallis ’Oh So Black’
- Oh So Bright Daylily: Hemerocallis ’Oh So Bright’
- Oh So Charming Daylily: Hemerocallis ’Oh So Charming’
- Oh So Curly Daylily: Hemerocallis ’Oh So Curly’
- Oh So Different Daylily: Hemerocallis ’Oh So Different’
- Oh So Elegant Daylily: Hemerocallis ’Oh So Elegant’
- Oh So Fine Daylily: Hemerocallis ’Oh So Fine’
- Oh So Gay Daylily: Hemerocallis ’Oh So Gay’
- Oh So Generous Daylily: Hemerocallis ’Oh So Generous’
- Oh So Novel Daylily: Hemerocallis ’Oh So Novel’
- Oh So Orange Daylily: Hemerocallis ’Oh So Orange’
- Oh So Pretty Daylily: Hemerocallis ’Oh So Pretty’
- Oh So Purple Daylily: Hemerocallis ’Oh So Purple’
- Oh So Red Daylily: Hemerocallis ’Oh So Red’
- Oh So Round Daylily: Hemerocallis ’Oh So Round’
- Oh So Royal Daylily: Hemerocallis ’Oh So Royal’
- Oh So Showy Daylily: Hemerocallis ’Oh So Showy’
- Oh So Smooth Daylily: Hemerocallis ’Oh So Smooth’
- Oh So Sweet Daylily: Hemerocallis ’Oh So Sweet’
- Oh So White Daylily: Hemerocallis ’Oh So White’
- Oh So Worthy Daylily: Hemerocallis ’Oh So Worthy’
- Oh Suzanne Daylily: Hemerocallis ’Oh Suzanne’
- Oh That Red Daylily: Hemerocallis ’Oh That Red’
- Oh Yeah Daylily: Hemerocallis ’Oh Yeah’
- Oh Yes Daylily: Hemerocallis ’Oh Yes’
- Ohai: Colvillea racemosa, Schleinitzia insularum, Sesbania tomentosa
- Ohe: Isachne distichophylla
- Ohelo: Vaccinium dentatum
- Ohelo ’ai: Vaccinium reticulatum
- Ohelo Kau La’au: Vaccinium calycinum
- Ohia Lehua: Metrosideros polymorpha
- Ohia Lehua (Hawaii): Metrosideros collina
- Ohia Lehua In Hawaii: Metrosideros collina ’Springfire’
- Ohia-lehua: Metrosideros thomasii
- Ohiaku: Hymenophyllum recurvum
- Ohio 2070 Tomato Lycopersicon Lycopersicum: Lycopersicon lycopersicum ’Ohio 2070’
- Ohio 2170 Tomato Lycopersicon Lycopersicum: Lycopersicon lycopersicum ’Ohio 2170’
- Ohio 2470 Tomato Lycopersicon Lycopersicum: Lycopersicon lycopersicum ’Ohio 2470’
- Ohio 736 Tomato Lycopersicon Lycopersicum: Lycopersicon lycopersicum ’Ohio 736’
- Ohio 7663 Tomato Lycopersicon Lycopersicum: Lycopersicon lycopersicum ’Ohio 7663’
- Ohio 7681 Tomato Lycopersicon Lycopersicum: Lycopersicon lycopersicum ’Ohio 7681’
- Ohio 7814 Tomato Lycopersicon Lycopersicum: Lycopersicon lycopersicum ’Ohio 7814’
- Ohio 7870 Tomato Lycopersicon Lycopersicum: Lycopersicon lycopersicum ’Ohio 7870’
- Ohio 7983 Tomato Lycopersicon Lycopersicum: Lycopersicon lycopersicum ’Ohio 7983’
- Ohio 8243 Tomato Lycopersicon Lycopersicum: Lycopersicon lycopersicum ’Ohio 8243’
- Ohio 8245 Tomato Lycopersicon Lycopersicum: Lycopersicon lycopersicum ’Ohio 8245’
- Ohio 832 Tomato Lycopersicon Lycopersicum: Lycopersicon lycopersicum ’Ohio 832’
- Ohio 8556 Tomato Lycopersicon Lycopersicum: Lycopersicon lycopersicum ’Ohio 8556’
- Ohio Archidium Moss: Archidium ohioense
- Ohio Buckeye: Aesculus ’Autumn Splendor’, Aesculus glabra, Aesculus glabra ’Fall Red’, Aesculus glabra ’Klein’s Weeping’
- Ohio Crack Resistant Red Tomato Lycopersicon Lycopersicum: Lycopersicon lycopersicum ’Ohio Crack Resistant Red’
- Ohio Goldenrod: Oligoneuron ohioense, Solidago ohiensis
- Ohio Horsemint: Blephilia ciliata
- Ohio Orthotrichum Moss: Orthotrichum ohioense
- Ohio Ox38 Tomato Lycopersicon Lycopersicum: Lycopersicon lycopersicum ’Ohio OX38’
- Ohio Polytrichum Moss: Polytrichum ohioense
- Ohio Spiderwort: Tradescantia ohiensis, Tradescantia ohiensis ’Snowcap’
- Ohio Sunrise Daylily: Hemerocallis ’Ohio Sunrise’
- Ohio Supreme Daylily: Hemerocallis ’Ohio Supreme’
- Ohio Twinkle Daylily: Hemerocallis ’Ohio Twinkle’
- Ohio Wilt Resistant Globe Tomato Lycopersicon Lycopersicum: Lycopersicon lycopersicum ’Ohio Wilt Resistant Globe’
- Ohio Wr Brookston Tomato Lycopersicon Lycopersicum: Lycopersicon lycopersicum ’Ohio WR Brookston’
- Ohio Wr Jubilee Tomato Lycopersicon Lycopersicum: Lycopersicon lycopersicum ’Ohio WR Jubilee’
- Ohio Wr Seven Tomato Lycopersicon Lycopersicum: Lycopersicon lycopersicum ’Ohio WR Seven’
- Ohs And Ahs Daylily: Hemerocallis ’Oh’s And Ah’s’
- Oil Bean Tree: Pentaclethra macrophylla
- Oil Cloth Flower: Anthurium andreanum
- Oil Grass: Cymbopogon citratus
- Oil Neststraw: Stylocline citroleum
- Oil Painting Daylily: Hemerocallis ’Oil Painting’
- Oil Seed Rape: Brassica napus, Brassica napus ’Dwarf Essex’
- Oil Shale Columbine: Aquilegia barnebyi
- Oil Shale Fescue: Festuca dasyclada
- Oilbean Tree: Pentaclethra macrophylla
- Oilcloth Flower: Anthurium andraeanum ’Alani’, Anthurium andraeanum ’Hawaiian Sunrise’, Anthurium andraeanum ’Lime Light’, Anthurium andraeanum ’Midori’, Anthurium andraeanum ’Tangerine’, Anthurium andreanum
- Oilnut: Pyrularia olcifera
- Oilseed Radish: Raphanus sativus var. oleiformis
- Oilshale Cryptantha: Cryptantha barnebyi
- Oiltree: Derris elliptica
- Oiseau D’or Canna Lily: Canna x generalis’Oiseau d’Or’
- Oiseau De Feu Canna Lily: Canna x generalis’Oiseau de Feu’
- Oiteira: Plathymenia reticulata
- Oiticica: Licania rigida
- Ojai Fritillary: Fritillaria affinis, Fritillaria affinis var. affinis (Schult.) Sealy, Fritillaria ojaiensis
- Ojai Spider Daylily: Hemerocallis ’Ojai Spider’
- Ojibwa Dancer Daylily: Hemerocallis ’Ojibwa Dancer’
- Ojibwa Feather Daylily: Hemerocallis ’Ojibwa Feather’
- Ojibwa Flower Daylily: Hemerocallis ’Ojibwa Flower’
- Ojibwa Heart Daylily: Hemerocallis ’Ojibwa Heart’
- Ojibwa Magic Daylily: Hemerocallis ’Ojibwa Magic’
- Ojibwa Princess Daylily: Hemerocallis ’Ojibwa Princess’
- Ojibwa Queen Daylily: Hemerocallis ’Ojibwa Queen’
- Ojibwa Rose Daylily: Hemerocallis ’Ojibwa Rose’
- Ojitos De Picho: Rhynchosia pyramidalis
- Ojo Alamo Fleabane: Erigeron bistiensis
- Ojo De Buey: Dioclea megacarpa, Mucuna sloanei
- Ojo De Cangrejo: Rhynchosia pyramidalis
- Ojo De Mono: Dioclea megacarpa
- Ojo De Venado: Caesalpinia bonduc, Mucuna mutisiana
- Ojo De Vibora: Evolvulus alsinoides
- Oka-Nori: Prasiola crispa, Prasiola crispa antarctica, Prasiola crispa sudetica
- Okame Cherry: Prunus ’Okame’
- Okame Formosan Flowering Cherry: Prunus campanulata ’Okame’
- Okame Heavenly Bamboo: Nandina domestica ’Okame’
- Okame-Zasa: Shibataea kumasasa
- Okame-Zasa Bamboo: Shibataea kumasasa
- Okan: Cylicodiscus gabunensis
- Okan Hosta: Hosta ’Okan’
- Okanagan Daylily: Hemerocallis ’Okanagan’
- Okanagan Fame Flower: Talinum sediforme
- Okanagan Valley Hawthorn: Crataegus okanaganensis
- Okanogan Fameflower: Talinum sediforme
- Okanogan Stickseed: Hackelia ciliata
- Okaydokey Hosta: Hosta ’Okaydokey’
- Okeechobee Gourd: Cucurbita okeechobeensis
- Okefenokee Hosta: Hosta ’Okefenokee’
- Oken: Bobgunnia fistuloides
- Okera: Atractylodes japonica
- Okhotian Bugseed: Corispermum ochotense
- Okhotsk Blacksmelt: Vaccinium exrampelinum
- Okie Baby Doll Daylily: Hemerocallis ’Okie Baby Doll’
- Okie Bean: Dipogon lignosus
- Okie Red Boots Daylily: Hemerocallis ’Okie Red Boots’
- Okinawa Holly: Ilex dimorphophylla
- Okinawan Spinach: Gynura crepioides
- Oklahoma Bandit Intermediate Bearded Iri: Iris ’Oklahoma Bandit’
- Oklahoma Beardtongue: Penstemon oklahomensis
- Oklahoma Blackberry: Rubus oklahomus
- Oklahoma City Daylily: Hemerocallis ’Oklahoma City’
- Oklahoma Crude Tall Bearded Iris: Iris ’Oklahoma Crude’
- Oklahoma Dandy Daylily: Hemerocallis ’Oklahoma Dandy’
- Oklahoma Dewberry: Rubus oklahomus
- Oklahoma Gold Daylily: Hemerocallis ’Oklahoma Gold’
- Oklahoma Grass-Pink: Calopogon oklahomensis
- Oklahoma Grasspink: Calopogon oklahomensis
- Oklahoma Hybrid Tea Rose: Rosa ’Oklahoma’
- Oklahoma Kicking Bird Daylily: Hemerocallis ’Oklahoma Kicking Bird’
- Oklahoma Penstemon: Penstemon oklahomensis
- Oklahoma Phlox: Phlox oklahomensis
- Oklahoma Plum: Prunus gracilis
- Oklahoma Redbud: Cercis canadensis var. texensis ’Oklahoma’, Cercis reniformis ’Oklahoma’
- Oklahoma Rose: Rubus oklahomus
- Oklahoma Saxifrage: Saxifraga virginiensis var. subintegra
- Oklahoma Sedge: Carex oklahomensis
- Oklahoma Star Daylily: Hemerocallis ’Oklahoma Star’
- Oklahoma Sunset Daylily: Hemerocallis ’Oklahoma Sunset’
- Okmulgee Crapemyrtle: Lagerstroemia indica ’Okmulgee’
- Okra: Abelmoschus esculentus, Abelmoschus esculentus ’Alabama Red’, Abelmoschus esculentus ’Annie Oakley’, Abelmoschus esculentus ’Annie Oakley Ii’, Abelmoschus esculentus ’Arabica’, Abelmoschus esculentus ’Aunt Hettie’s Red’, Abelmoschus esculentus ’Baby Bubba’, Abelmoschus esculentus ’Beck’s Big Buck Horn’, Abelmoschus esculentus ’Big’un’, Abelmoschus esculentus ’Blondie’, Abelmoschus esculentus ’Burmese’, Abelmoschus esculentus ’Cajun Delight’, Abelmoschus esculentus ’Cajun Jewel’, Abelmoschus esculentus ’Clemson Spineless’, Abelmoschus esculentus ’Cowhorn’, Abelmoschus esculentus ’Cowhorn 22’, Abelmoschus esculentus ’Dad Speegle’s Special’, Abelmoschus esculentus ’Emerald’, Abelmoschus esculentus ’Evertender’, Abelmoschus esculentus ’Ever Lucky’, Abelmoschus esculentus ’F696’, Abelmoschus esculentus ’F715’, Abelmoschus esculentus ’Fife Creek Cowhorn’, Abelmoschus esculentus ’Greennie’, Abelmoschus esculentus ’Green Best’, Abelmoschus esculentus ’Green Energy’, Abelmoschus esculentus ’Green Glory’, Abelmoschus esculentus ’Green Jewel’, Abelmoschus esculentus ’Green Power’, Abelmoschus esculentus ’Hill Country Heirloom Red’, Abelmoschus esculentus ’Indiana’, Abelmoschus esculentus ’Jade’, Abelmoschus esculentus ’Jakkawad’, Abelmoschus esculentus ’James Hopper’, Abelmoschus esculentus ’Jet’, Abelmoschus esculentus ’Jimmy T’, Abelmoschus esculentus ’Jing Orange’, Abelmoschus esculentus ’Joy’, Abelmoschus esculentus ’Jubilee’, Abelmoschus esculentus ’Lee’, Abelmoschus esculentus ’Lima’, Abelmoschus esculentus ’Little Lucy’, Abelmoschus esculentus ’Lomax’, Abelmoschus esculentus ’Louisiana Green Velvet’, Abelmoschus esculentus ’Lousiana Short’, Abelmoschus esculentus ’Lucky Five’, Abelmoschus esculentus ’Mac Green’, Abelmoschus esculentus ’Mexicana’, Abelmoschus esculentus ’My Joanie’, Abelmoschus esculentus ’Pentagreen’, Abelmoschus esculentus ’Penta Dragon’, Abelmoschus esculentus ’Perkins Mammoth Long Pod’, Abelmoschus esculentus ’Pure Luck’, Abelmoschus esculentus ’Puso’, Abelmoschus esculentus ’Red Burgundy’, Abelmoschus esculentus ’Red Okra’, Abelmoschus esculentus ’Rouge De Thiès’, Abelmoschus esculentus ’Silver Queen’, Abelmoschus esculentus ’Sok 6101’, Abelmoschus esculentus ’South Sea’, Abelmoschus esculentus ’Star of David’, Abelmoschus esculentus ’Stubby’, Abelmoschus esculentus ’Top Gun’, Abelmoschus esculentus ’Volta’, Abelmoschus esculentus ’White Velvet’
- Okra Chrysanthemum: Chrysanthemum’Okra’
- Oksana Daylily: Hemerocallis ’Oksana’
- Oktoberfest Tall Bearded Iris: Iris ’Oktoberfest’
- Okuro: Albizia zygia
- Okushimo Japanese Maple: Acer palmatum var. Okushimo
- Ola Kala Tall Bearded Iris: Iris ’Ola Kalá’
- Ola’a: Rubus rosifolius
- Olaga: Opuntia borinquensis
- Olallie Apricot Daylily: Hemerocallis ’Olallie Apricot’
- Olallie Daybreak Daylily: Hemerocallis ’Olallie Daybreak’
- Olallie Delight Daylily: Hemerocallis ’Olallie Delight’
- Olallie Double Daylily: Hemerocallis ’Olallie Double’
- Olallie Ethel Peters Daylily: Hemerocallis ’Olallie Ethel Peters’
- Olallie Firecracker Daylily: Hemerocallis ’Olallie Firecracker’
- Olallie Flamenco Daylily: Hemerocallis ’Olallie Flamenco’
- Olallie George Darrow Daylily: Hemerocallis ’Olallie George Darrow’
- Olallie Gold Daylily: Hemerocallis ’Olallie Gold’
- Olallie Gold Rim Daylily: Hemerocallis ’Olallie Gold Rim’
- Olallie Harvest Moon Daylily: Hemerocallis ’Olallie Harvest Moon’
- Olallie Jewel Daylily: Hemerocallis ’Olallie Jewel’
- Olallie Keith Daylily: Hemerocallis ’Olallie Keith’
- Olallie Kevin Daylily: Hemerocallis ’Olallie Kevin’
- Olallie Lass Daylily: Hemerocallis ’Olallie Lass’
- Olallie Late Show Daylily: Hemerocallis ’Olallie Late Show’
- Olallie Lavender Daylily: Hemerocallis ’Olallie Lavender’
- Olallie Light Hearted Daylily: Hemerocallis ’Olallie Light Hearted’
- Olallie Lime Daylily: Hemerocallis ’Olallie Lime’
- Olallie Lois Daylily: Hemerocallis ’Olallie Lois’
- Olallie Mack Daylily: Hemerocallis ’Olallie Mack’
- Olallie Orange Daylily: Hemerocallis ’Olallie Orange’
- Olallie Orchid Daylily: Hemerocallis ’Olallie Orchid’
- Olallie Peach Parade Daylily: Hemerocallis ’Olallie Peach Parade’
- Olallie Perky Purple Daylily: Hemerocallis ’Olallie Perky Purple’
- Olallie Petite Daylily: Hemerocallis ’Olallie Petite’
- Olallie Pink Lady Daylily: Hemerocallis ’Olallie Pink Lady’
- Olallie Rainbow Daylily: Hemerocallis ’Olallie Rainbow’
- Olallie Red Daylily: Hemerocallis ’Olallie Red’
- Olallie Royal Velvet Daylily: Hemerocallis ’Olallie Royal Velvet’
- Olallie Sandra Daylily: Hemerocallis ’Olallie Sandra’
- Olallie Star Daylily: Hemerocallis ’Olallie Star’
- Olallie Summer Daylily: Hemerocallis ’Olallie Summer’
- Olancha Peak Buckwheat: Eriogonum wrightii var. olanchense
- Olancha Peak Wild Buckwheat: Eriogonum wrightii var. olanchense
- Olapa: Cheirodendron forbesii, Cheirodendron trigynum
- Olapalapa: Cheirodendron trigynum, Cheirodendron trigynum helleri, Cheirodendron trigynum trigynum
- Olax: Olax stricta
- Old Barnyard Rooster Daylily: Hemerocallis ’Old Barnyard Rooster’
- Old Black Magic Tall Bearded Iris: Iris ’Old Black Magic’
- Old Blue Eyes Daylily: Hemerocallis ’Old Blue Eyes’
- Old Blue Eyes Tall Bearded Iris: Iris ’Old Blue Eyes’
- Old Blue False Pennyroyal: Hedeoma pilosa
- Old Blue Pennyroyal: Hedeoma pilosa
- Old Blush Parson’s Pink China Rose: Rosa ’Old Blush’
- Old Bourbon Rose: Rosa ’Reverend H. D’ombrian’
- Old Dependable Daylily: Hemerocallis ’Old Dependable’
- Old Faithful Hosta: Hosta ’Old Faithful’
- Old Fashion Love Daylily: Hemerocallis ’Old Fashion Love’
- Old Fashioned Bleeding Heart: Lamprocapnos spectabilis
- Old Fashioned Girl Daylily: Hemerocallis ’Old Fashioned Girl’
- Old Fashioned Rose: Pelargonium graveolens
- Old Fashioned Vining Petunia: Petunia multiflora
- Old Fashioned Weigela: Weigela florida
- Old Father Live-Forever: Pelargonium cotyledonis
- Old Field Birch: Betula populifolia
- Old Field Sneezeweed: Helenium campestre
- Old Flame Daylily: Hemerocallis ’Old Flame’
- Old Flame Tall Bearded Iris: Iris ’Old Flame’
- Old Flame Tomato: Lycopersicon lycopersicum ’Old Flame’
- Old Four Legs: Malachra gossiipifolia
- Old Garden Rose: Rosa ’Abel Carrière’, Rosa ’Abendröte’, Rosa ’Aimable Rouge’, Rosa ’Alain Blanchard’, Rosa ’Alcime’, Rosa ’Alfred Colomb’, Rosa ’Alice Vena’, Rosa ’Amazone’, Rosa ’Amélia’, Rosa ’American Beauty’, Rosa ’Anaïs Ségalas’, Rosa ’Anna de Diesbach’, Rosa ’Ardoisée de Lyon’, Rosa ’Ards Rover’, Rosa ’Arrillaga’, Rosa ’Aurora’, Rosa ’Autumnalis’, Rosa ’Baltimore Belle’, Rosa ’Baroness Rothschild’, Rosa ’Baronne Prévost’, Rosa ’Baron von Bonstetten’, Rosa ’Belle Amour’, Rosa ’Belle des Jardins’, Rosa ’Belle de Crécy’, Rosa ’Berangere’, Rosa ’Blairii No. 2’, Rosa ’Blanchefleur’, Rosa ’Bougainville’, Rosa ’Boule de Neige’, Rosa ’Brennus’, Rosa ’Brightside Cream’, Rosa brunonii ’La Mortola’, Rosa ’Cardinal de Richelieu’, Rosa ’Caroline Kuster’, Rosa ’Cesonie’, Rosa ’Champion of the World’, Rosa ’Charles Lawson’, Rosa ’Charles Lefèbvre’, Rosa ’Chevreul’, Rosa ’Cocarde Pâle’, Rosa ’Commandant Beaurepaire’, Rosa ’Comtesse de Lacépède’, Rosa ’Comtesse de Murinais’, Rosa ’Coquette des Blanches’, Rosa ’Daniel Lacombe’, Rosa ’Darius’, Rosa ’Delille’, Rosa ’Desgaches’, Rosa ’De Meaux’, Rosa ’Duchesse de Montebello’, Rosa ’Duchesse de Rohan’, Rosa ’Duc de Fitzjames’, Rosa ’Duke of Edinburgh’, Rosa ’Duke of Teck’, Rosa ’Duke of York’, Rosa dupontii, Rosa ’Dupuy Jamain’, Rosa ’Dutch Provence’, Rosa ’Eclair’, Rosa ’Elie Beauvillain’, Rosa ’Elyse Flory’, Rosa ’Empereur du Maroc’, Rosa ’Enfant de France’, Rosa ’Étendard de Jeanne d’Arc’, Rosa ’Eugène de Beauharnais’, Rosa ’Eugène Fürst’, Rosa ’Eugénie Guinoisseau’, Rosa ’Everest’, Rosa ’Fellenberg’, Rosa ’Frau Karl Druschki’, Rosa ’Frazer’s Pink Musk’, Rosa ’Furst Bismarck’, Rosa ’Géant des Batailles’, Rosa ’Général Galliéni’, Rosa ’Général Jacqueminot’, Rosa ’Général Kléber’, Rosa ’Georg Arends’, Rosa ’Gertrud Schweitzer’, Rosa ’Glendora’, Rosa ’Gloire des Rosomanes’, Rosa ’Gloire De Chédane-guinoisseau’, Rosa ’Gloire de Ducher’, Rosa ’Gloire Lyonnaise’, Rosa glutinosa, Rosa ’Golden Moss’, Rosa ’Grace Darling’, Rosa ’Granny Grimmetts’, Rosa ’Great Western’, Rosa ’Gribaldo Nicola’, Rosa ’Gros Choux d’Hollande’, Rosa ’Grüss an Teplitz’, Rosa ’Henri Martin’, Rosa ’Henry Nevard’, Rosa ’Heröine de Vaucluse’, Rosa ’Hortense Vernet’, Rosa ’Hugh Dickson’, Rosa ’Huilito’, Rosa ’Hypathia’, Rosa ’Impératrice Eugénie’, Rosa ’Jacques Amyot’, Rosa ’James Bourgault’, Rosa ’James Veitch’, Rosa ’Juno’, Rosa ’Lady Emily Peel’, Rosa ’La Reine’, Rosa ’Leda’, Rosa ’Le Vésuve’, Rosa ’L’Ingenue’, Rosa ’Louise d’Arzens’, Rosa ’Louis XIV’, Rosa ’Madame Fanny de Forest’, Rosa ’Madame Foureau’, Rosa ’Madame Francois Pittet’, Rosa ’Madame Massot’, Rosa ’Madame Plantier’, Rosa ’Mademoiselle Mathilde Lenaerts’, Rosa ’Maggie’, Rosa ’Malton’, Rosa ’Marchesa Boccella’, Rosa ’Marchioness of Londonderry’, Rosa ’Mme A. Labbey’, Rosa ’Monsieur Rosier’, Rosa ’Moore’s Classic Perpetual’, Rosa ’Moore’s Pink Perpetual’, Rosa ’Mrs. John Laing’, Rosa ’Mrs Bosanquet’, Rosa multiflora ’Seven Sisters’, Rosa ’Narrow Water’, Rosa ’Nouveau Monde’, Rosa ’Old Blush’, Rosa ’Oskar Cordel’, Rosa ’Papa Hémeray’, Rosa ’Parkzierde’, Rosa ’Paul Ricault’, Rosa ’Penelope’, Rosa ’Perle d’ Or’, Rosa ’Petite Lisette’, Rosa ’Petite Orleanaise’, Rosa ’Pink Pet’, Rosa ’Président Dutailly’, Rosa ’Princesse Adélaïde’, Rosa ’Princesse de Joinville’, Rosa ’Prince Camille de Rohan’, Rosa ’Prolifera de Redouté’, Rosa ’Quatre Saisons Blanc Mousseaux’, Rosa ’Reine Blanche’, Rosa ’Reine des Centfeuilles’, Rosa ’Rose de Meaux White’, Rosa ’Setina’, Rosa ’Souvenir d’Alphonse Lavallée’, Rosa ’Souvenir de François Gaulain’, Rosa ’Souvenir de Pierre Dupuy’, Rosa ’Souvenir de Victor Landeau’, Rosa ’Spencer’, Rosa ’Spong’, Rosa ’The Bishop’, Rosa ’The Garland’, Rosa ’Ulrich Brunner Fils’, Rosa ’Unique Panachée’, Rosa ’Velouté d’Orléans’, Rosa ’Victor Emmanuel’, Rosa ’Vivid’, Rosa ’Waldfee’, Rosa ’William Allen Richardson’, Rosa x alba’Foliacea’, Rosa x alba’Maxima’, Rosa × centifolia
- Old Glory Hosta: Hosta ’Old Glory’
- Old Grey Eyes Daylily: Hemerocallis ’Old Grey Eyes’
- Old Gum Tree: Eucalyptus microtheca
- Old Irish Blessing Daylily: Hemerocallis ’Old Irish Blessing’
- Old King Cole Daylily: Hemerocallis ’Old King Cole’
- Old Lady Cactus: Mammillaria hahniana
- Old Ma Daylily: Hemerocallis ’Old Ma’
- Old Man: Artemisia abrotanum, Artemisia abrotanum ’Tangerine’
- Old Man and Woman: Sempervivum calcareum, Sempervivum calcareum ’Extra’, Sempervivum calcareum ’Greenii’, Sempervivum calcareum ’Limelight’, Sempervivum calcareum ’Sir William Lawrence’, Sempervivum tectorum, Sempervivum tectorum ’Atroviolaceum’, Sempervivum tectorum ’Fame’, Sempervivum tectorum’Red Beauty’, Sempervivum tectorum ’Saturn’, Sempervivum tectorum ’Snowberger’, Sempervivum tectorum ’Sunset’
- Old Man Cactus: Cephalocereus senilis, Cephalocereus senilis f. cristata, Pilosocereus leucocephalus, Pilosocereus leucocephalus f. palmeri
- Old Man of Mexico: Pilosocereus leucocephalus, Pilosocereus leucocephalus f. palmeri
- Old Man of the Andes: Oreocereus celsianus, Oreocereus celsianus var. lecoriensis, Oreocereus celsianus var. maximus, Oreocereus celsianus var. rubrispinus, Oreocereus doelzianus, Oreocereus magnificus, Oreocereus trollii
- Old Man of the Mountain: Oreocereus trollii
- Old Man Orchid: Dendrobium senile
- Old Man Palm: Coccothrinax crinita, Coccothrinax crinita crinita
- Old Man Weed: Centipeda cunninghamii
- Old Man Whiskers: Opuntia acicularis
- Old Man’s Beard: Arthrostylidium farctum, Chionanthus virginica, Clematis drummondii, Clematis vitalba,
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