- Obregonia denegrii
Artichoke Cactus, Pine Cone Cactus - Ochagavia litoralis
Calilla Bromeliad - Ochna serrulata
Bird's Eye Bush, Mickey Mouse Plant - Ocimum basilicum
Basil, Sweet Basil, Thai Basil - Ocimum basilicum Dark Opal
Purple Basil, Dark Opal Sweet Basil - Ocimum basilicum Genovese
Basil, Sweet Basil, Thai Basil - Ocimum basilicum Purple Ruffles
Basil - Ocimum tenuiflorum
Holy Basil, Sacred Basil, Tulsi - Odontonema tubaeforme
Fire Spike - Oemleria cerasiformis
Indian Plum, Oso Berry - Oenanthe javanica
Water Celery, Water Parsley, Java Water Drop Wort - Oenanthe javanica Flamingo
Variegated Water Celery, Water Parsley - Oenocarpus bacaba
Bacaba Palm, Turu Palm - Oenothera acaulis
Evening Primrose, Dandelion Leaf Sun Drop - Oenothera albicaulis
Evening Primrose - Oenothera biennis
Evening Primrose - Oenothera caespitosa
White Evening Primrose, Fragrant Evening Primrose, Tufted Evening Primrose, Gumbo Lily, Butte Primrose - Oenothera fruticosa Yellow River
Yellow River Sun Drops, Narrow Leaf Evening Primrose - Oenothera macrocarpa
Ozark Sun Drops, Big Fruited Evening Primrose, Glade Lily - Oenothera perennis
Sun Drops - Oenothera speciosa
Pink Evening Primrose, White Evening Primrose, Pink Ladies, Showy Evening Primrose - Oenothera speciosa Alba
White Evening Primrose - Olea europaea communis
European Olive - Olea europaea cuspidata
African Olive - Olearia albida
Daisy Bush, Tanguru - Olearia argophylla
Musk Daisy Bush - Olearia asterotricha
Rough Daisy Bush - Olearia avicenniaefolia
Akeake - Olearia cheesemanii
Streamside Tree Daisy - Olearia ciliata
Fringed Daisy Bush - Olearia elliptica
Sticky Daisy Bush - Olearia erubescens
Daisy Bush - Olearia frostii
Daisy Bush - Olearia ilicifolia
Mountain Holly, Hakeke - Olearia lacunosa
Rough Leaf Tree Daisy - Olearia macrodonta
Arorangi, New Zealand Holly - Olearia microphylla
Small Leaf Daisy Bush - Olearia moschata
Incense Plant - Olearia myrsinoides
Silky Daisy Bush, Blush Daisy Bush - Olearia nummulariifolia
Daisy Bush - Olearia phlogopappa
Alpine Daisy Bush, Dusty Daisy Bush - Olearia quercifolia
Oak Leaf Daisy Bush - Olearia ramulosa
Twiggy Daisy Bush - Olearia solandri
Coastal Tree Daisy - Olearia tomentosa
Downy Daisy Bush, Toothed Daisy Bush - Olearia traversii
Akeake - Olearia virgata
Twiggy Tree Daisy - Olearia viscidula
Wallaby Weed - Olneya tesota
Desert Ironwood - Olsynium biflorum
Olsynium - Olsynium douglasii
Grass Widow, Purple Eyed Grass - Omphalodes cappadocica Cherry Ingram
Cherry Ingram Navel Wort - Omphalodes linifolia
Venus's Navel Wort, White Flower Navel Wort - Omphalodes luciliae
Navel Wort - Omphalodes verna
Blue Eyed Mary, Creeping Forget-Me-Not, Navel Wort - Omphalogramma vinciflorum
Omphalogramma - Oncidium
Oncidium, Dancing Lady Orchid - Onoclea sensibilis
Sensitive Fern - Ononis repens
Rest Harrow - Onopordum acanthium
Scotch Thistle, Cotton Thistle, Heraldic Thistle, Giant Thistle - Onopordum nervosum
Scotch Thistle, Moor's Cotton Thistle - Ophiopogon intermedius Argenteomarginatus
Variegated Mondo Grass, Stripey White - Ophiopogon jaburan Vittatus
Variegated Jaburan Lily - Ophiopogon japonicus
Mondo Grass, Dwarf Lily Turf - Ophiopogon japonicus Bali Stripe
Variegated Mondo Grass - Ophiopogon japonicus Nana
Dwarf Mondo Grass - Ophiopogon japonicus Silver Dragon
Variegated Mondo Grass - Ophiopogon planiscapus Nigrescens
Black Mondo Grass - Ophthalmophyllum
Ophthalmophyllum - Oplismenus hirtellus
Basket Grass - Oplismenus hirtellus Variegatus
Variegated Basket Grass - Opuntia erinacea
Grizzly Bear Prickly Pear - Opuntia microdasys Albispina
Teddy Bear Cactus, Bunny Ears Prickly Pear, Polka Dot Cactus - Opuntia monacantha
Drooping Prickly Pear, Cochineal Prickly Pear - Opuntia monacantha variegata
Joseph's Coat Cactus, Prickly Pear - Opuntia robusta
Wheel Cactus - Opuntia santarita
Purple Prickly Pear - Orbea dummeri
Orbea - Orbea variegata
Starfish Cactus, African Carrion Flower, Toad Cactus, Snake Plant - Orbeopsis albocastanea
Orbeopsis - Orbeopsis lutea
Orbeopsis - Orchis mascula
Early Purple Orchid - Oreocereus celsianus
Snow Pole Cactus, Old Man Cactus, Old Man of the Andes - Origanum amanum
Oregano - Origanum dictamnus
Hop Marjoram, Dittany of Crete - Origanum laevigatum
Purple Oregano, Ornamental Oregano - Origanum laevigatum Herrenhausen
Oregano - Origanum majorana
Sweet Marjoram - Origanum onites
Pot Marjoram, Cretan Oregano | - Origanum vulgare
Oregano, Wild Marjoram - Origanum vulgare Aureum
Golden Oregano - Origanum vulgare Thumbles Variety
Golden Oregano - Orixa japonica
Orixa - Orlaya grandiflora
White Lace Flower, Large Flowered Orlaya - Ornithogalum candicans
Cape Hyacinth, Summer Hyacinth, Spire Lily - Ornithogalum longibracteatum
False Sea Onion, Pregnant Onion, Wild Onion - Ornithogalum nutans
Star of Bethlehem - Ornithogalum pyrenaicum
Bath Asparagus, Prussian Asparagus, Spiked Star of Bethlehem, Pyrenees Star of Bethlehem - Ornithogalum thyrsoides
Chincherinchee, African Wonder Flower, Star of Bethlehem, Wonder Flower, Cape Lily, Black Eyed Susan - Ornithogalum thyrsoides Chesapeake Snowflake
Chesapeake Snowflake - Ornithogalum umbellatum
Star of Bethlehem, Summer Snow Flake, Star Flower, Sleepy Dick - Orontium aquaticum
Golden Club, Never Wet - Orostachys chanetii
Orostachys - Oroya peruviana
Oroya - Ortegocactus macdougallii
Ortegocactus - Orthophytum rubrum
Bromeliad - Orthosiphon aristatus
Cat's Whiskers, Java Tea - Orthrosanthus chimboracensis
Chimborazo Dawn Flower - Orthrosanthus multiflorus
Morning Flag, Blue Flag - Orychophragmus violaceus
Purple Flowered Rape - Oryza sativa Black Madras
Black Madras Rice - Osbeckia stellata
Osbeckia - Osmanthus burkwoodii
Burkwood Osmanthus - Osmanthus delavayi
Delavay Osmanthus, Sweet Olive, Chinese Holly - Osmanthus delavayi Heaven Scent
Heaven Scent Osmanthus - Osmanthus delavayi Pearly Gates
Pearly Gates Osmanthus - Osmanthus fragrans
Sweet Olive - Osmanthus fragrans Aurantiacus
Sweet Olive - Osmanthus heterophyllus
False Holly - Osmanthus heterophyllus Aureomarginatus
Variegated False Holly - Osmanthus heterophyllus Goshiki
Variegated False Holly - Osmanthus heterophyllus Purpureus
Purple False Holly - Osmanthus heterophyllus Variegatus
Variegated False Holly, Variegated Holly Olive - Osmanthus yunnanensis
Osmanthus - Osmoxylon lineare
Miagos Bush, Green Aralia - Osmunda cinnamomea
Cinnamon Fern - Osmunda claytoniana
Interrupted Fern - Osmunda regalis
Flowering Fern, Royal Fern - Osteomeles schweriniae
Chinese Emperor Plum - Osteospermum Akream
Akream Ox Eye Daisy - Osteospermum ecklonis
Ox Eye Daisy - Osteospermum ecklonis Akope
Akope Ox Eye Daisy - Osteospermum fruticosum Copper Yellow
Copper Yellow African Daisy - Osteospermum fruticosum Golden Yellow
Golden Yellow African Daisy - Osteospermum jucundum
Trailing Pink Daisy - Osteospermum Lime Splice
Lime Splice Veldt Daisy - Osteospermum Nasinga Purple
Nasinga Purple Cape Daisy - Osteospermum Nasinga White
Nasinga White Cape Daisy - Ostrowskia magnifica
Giant Bell Flower - Ostrya carpinifolia
Hop Hornbeam - Ostrya virginiana
American Hop Hornbeam, Ironwood - Otatea acuminata aztecorum
Mexican Weeping Bamboo - Ottelia ovalifolia
Swamp Lily - Ourisia caespitosa
Ourisia - Ourisia macrophylla
Mountain Foxglove - Ourisia microphylla
Ourisia - Oxalis acetosella subpurpurescens
Sorrel - Oxalis adenophylla
Sorrel - Oxalis chrysantha
Sorrel - Oxalis enneaphylla
Sorrel - Oxalis hedysaroides
Sorrel - Oxalis hirta
Sorrel - Oxalis laciniata
Sorrel - Oxalis obtusa
Primrose Wood Sorrel - Oxalis peridicaria
Oxalis - Oxalis purpurea
Large Flower Wood Sorrel, Four O'Clock - Oxalis tetraphylla
Lucky Clover - Oxalis versicolor
Sorrel - Oxera splendida
Glory Vine, Potato Vine, Buku - Oxydendrum arboreum
Sorrel Tree, Sour Wood - Oxylobium arborescens
Tall Shaggy Pea - Oxylobium cordifolium
Heart Leaf Shaggy Pea - Oxylobium ellipticum
Common Shaggy Pea - Oxylobium pulteneae
Wiry Shaggy Pea - Ozothamnus adnatus
Winged Everlasting - Ozothamnus argophyllus
Spicy Everlasting - Ozothamnus coralloides
Ozothamnus - Ozothamnus diosmifolius
Pill Flower, Ball Everlasting, Sago Flower - Ozothamnus diosmifolius Coral Flush
Pill Flower, Ball Everlasting, Sago Flower - Ozothamnus diosmifolius Radiance
Pill Flower, Ball Everlasting, Sago Flower - Ozothamnus diosmifolius Winter White
Pill Flower, Ball Everlasting, Sago Flower - Ozothamnus ferrugineus
Tree Everlasting - Ozothamnus ledifolius
Mountain Spice, Kerosene Bush - Ozothamnus rosmarinifolius
Sea Rosemary, Rosemary Everlasting - Ozothamnus rosmarinifolius Silver Jubilee
Sea Rosemary - Ozothamnus selago
Ozothamnus - Ozothamnus thyrsoideus
Snow in Summer
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