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Nowellia curvifolia
Opuntia microdasys ‘Alba’
White Polka Dot Cactus
Nuphar lutea
Yellow Pond Lily, Spatterdock
Opuntia microdasys ‘Monstrose’
Gold Swivel Cactus
Nuphar lutea ssp. advena
Spatterdock
Opuntia microdasys var. rufida
Cinnamon Cactus
Nuttallanthus canadensis
Blue Toadflax, Canada Toadflax
Opuntia phaeacantha
Desert Prickly Pear, Tulip Prickly Pear, Brown-spine Prickly Pear, Tulip Pricklypear
Nymphaea alba
European White Waterlily, White Lotus, White Water Rose, Nenuphar
Opuntia rufida
Prickly Pear Cactus
Nymphaea nouchali
Blue Star Water Lily
Opuntia santa-rita
Santa Rita Purple Prickly Pear, Santa Rita Pricklypear
Nymphaea odorata
Fragrant Water Lily, Beaver Root, American White Waterlily
Opuntia spinosibacca
Nymphaea odorata ssp. tuberosa
Fragrant White Water Lily
Opuntia tortispina
Nymphaeaceae
Water Lily
Orbea lutea subsp. lutea
Yellow Carrion Flower
Nymphoides aquatica
Floating Heart
Orchidaceae
Nyssa sylvatica
Black Gum, Black Tupelo, Swamp Tupelo
Origanum ‘Kent Beauty’
Ornamental Oregano
Obolaria virginica
Virginia Pennywort
Origanum laevigatum ‘Herrenhausen’
Oregano
Ocimum basilicum ‘Amethyst Improved’
Basil
Origanum vulgare ‘Aureum’
Golden Oregano
Oclemena acuminata
Whorled Wood Aster, Mountain Aster, Sharp-leaved Aster
Ornithogalum umbellatum
Star of Bethlehem, Grass Lily, Nap-at-Noon, Eleven-o’clock Lady, Star-of-Bethlehem
Oenothera biennis
Common Evening Primrose
Orobanche minor
Small Broomrape
Oenothera caespitosa
Tufted Evening Primrose, Fragrant Evening Primrose
Orobanche uniflora
Naked Broomrape, One-flowered Cancer-root, Cancer-root
Oenothera deltoides
Desert Primrose, Birdcage Evening Primrose, Basket Evening Primrose, Lion in a Cage, Devil's Lantern
Orontium aquaticum
Golden Club, Floating Arum, Never-wets, Tawkin
Oenothera flava ssp. taraxacoides
Yellow Evening Primrose
Oryza sativa ‘Red Dragon’
Rice
Oenothera fruticosa
Narrowleaf Evening Primrose, Common Sundrops
Osmorhiza claytonii
Sweet Cicely, Clayton’s Sweetroot, Sweet Jarvil, Woolly Sweet Cicely
Oenothera fruticosa ssp. glauca
Sundrops
Osmunda cinnamomea
Cinnamon Fern
Oenothera macrocarpa
Bigfruit Evening Primrose
Osmunda claytoniana
Interrupted Fern
Oenothera pallida
Sawtooth Evening Primrose
Osmunda regalis
Royal Fern
Oenothera perennis
Little Evening Primrose
Osmunda regalis var. ‘Spectabilis’
Royal Fern
Oenothera pilosella
Prairie Sundrops
Osteospermum ‘Orange Symphony’
African Daisy, Cape Daisy
Oenothera simulans
Southern Beeblossom, Southern Gaura, Southern Butterly Weed, Morning Honeysuckle
Osteospermum ‘Osjaseclipur’
Soprano Lilac Spoon African Daisy
Oenothera villosa
Ostrya virginiana
Eastern Hophornbeam, Ironwood, Hophornbeam, Hop-hornbeam
Olea europaea
Common Olive Tree
Oxalis albicans
Hairy Woodsorrel, Radishroot Woodsorrel
Olea europaea ‘Little Ollie’
Dwarf Olive
Oxalis corniculata
Creeping Woodsorrel, Procumbent Yellow Sorrel, Sleeping Beauty, Creeping Wood Sorrel
Olneya tesota
Desert Ironwood
Oxalis debilis
Oxalis
Omphalotus illudens
Jack O'Lantern Mushroom
Oxalis montana
Common Wood Sorrel, Mountain Woodsorrel, Wood Shamrock, White Woodsorrel, Wood Sorrel
Omphalotus olearius
Jack O’Lantern
Oxalis stricta
Oxalis, Common Yellow Woodsorrel, Common Yellow Oxalis, Yellow Wood-Sorrel, Common Yellow Wood-sorrel
Oncidium ‘Burgundy’
Dancing Lady
Oxalis triangularis
Love Plant, Purple Shamrock, False Shamrock
Oncidium ‘Happy Valentine’
Dancing Lady
Oxalis violacea
Violet Wood Sorrel
Oncidium ‘Red Stars Rooster’
Oxydendrum arboreum
Sourwood
Oncostele ‘Golden Red Star’
Orchid
Oxypolis filiformis
Water Dropwort
Onoclea sensibilis
Sensitive Fern, Bead Fern, Meadow Brake
Oxytropis
Operculicarya decaryi
Jabily, Elephant Tree
Pachycereus marginatus
Mexican Fence Post Cactus, Organ Pipe Cactus, Mexican Fencepost
Opuntia
Prickly Pear Cactus, Prickly Pear, Cholla
Pachycereus pringlei
Cardón, Cardón Gigante, Cardón Pelón, Sagueso, Sahuaso
Opuntia atrispina
Pachycereus schottii
Señita Cactus, Old Man Cactus
Opuntia aurea
Creeping Beavertail, Yellow Beavertail
Pachypodium lamerei
Madagascar Palm
Opuntia basilaris var. basilaris
Beavertail Cactus
Pachysandra procumbens
Pachysandra, Alleghany Spurge, Alleghany Pachysandra
Opuntia engelmannii
Engelmann Prickly Pear, Cactus Apple
Pachysandra terminalis
Pachysandra, Japanese Spurge
Opuntia engelmannii var. cuija
Tuna, Cactus Apple
Pachystachys lutea
Golden Shrimp Plant, Lollipop Plant
Opuntia ficus-indica
Indian Fig, Indian Fig Prickly Pear, Mission Cactus, Nopal de Castilla, Smooth Mountain Prickly Pear, Smooth Prickly Pear, Tuberous Prickly Pear, Tuna de Castilla, Tuna Mansa
Packera anonyma
Small’s Ragwort
Opuntia galapageia
Galápagos Prickly Pear
Packera glabella
Cressleaf Groundsel, Butterweed
Opuntia humifusa
Eastern Prickly Pear
Packera neomexicana
New Mexico Groundsel
Opuntia laevis
Spineless Prickly Pear, Tulip Pricklypear
Packera obovata
Running Groundsel
Opuntia littoralis
Coast Prickly Pear, Sprawling Prickly Pear
Packera paupercula
Northern Meadow Groundsel
Opuntia macrocentra
Long-spined Prickly Pear, Black Spine Prickly Pear, Purple Pricklypear
Packera plattensis
Prairie Groundsel, Prairie Ragwort
Opuntia macrorhiza var. macrorhiza
Plains Prickly Pear
Paeonia
Peony