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