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Ocimum basilicum ‘Amethyst Improved’
Basil
Ornithogalum umbellatum
Star of Bethlehem, Grass Lily, Nap-at-Noon, Eleven-o’clock Lady, Star-of-Bethlehem
Oclemena acuminata
Whorled Wood Aster, Mountain Aster, Sharp-leaved Aster
Orobanche minor
Small Broomrape
Oenothera biennis
Common Evening Primrose
Orobanche uniflora
Naked Broomrape, One-flowered Cancer-root, Cancer-root
Oenothera caespitosa
Tufted Evening Primrose, Fragrant Evening Primrose
Orontium aquaticum
Golden Club, Floating Arum, Never-wets, Tawkin
Oenothera deltoides
Desert Primrose, Birdcage Evening Primrose, Basket Evening Primrose, Lion in a Cage, Devil's Lantern
Oryza sativa ‘Red Dragon’
Rice
Oenothera flava ssp. taraxacoides
Yellow Evening Primrose
Osmorhiza claytonii
Sweet Cicely, Clayton’s Sweetroot, Sweet Jarvil, Woolly Sweet Cicely
Oenothera fruticosa
Narrowleaf Evening Primrose, Common Sundrops
Osmunda cinnamomea
Cinnamon Fern
Oenothera fruticosa ssp. glauca
Sundrops
Osmunda claytoniana
Interrupted Fern
Oenothera macrocarpa
Bigfruit Evening Primrose
Osmunda regalis
Royal Fern
Oenothera pallida
Sawtooth Evening Primrose
Osmunda regalis var. ‘Spectabilis’
Royal Fern
Oenothera perennis
Little Evening Primrose
Osteospermum ‘Orange Symphony’
African Daisy, Cape Daisy
Oenothera pilosella
Prairie Sundrops
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 debilis
Oxalis
Olneya tesota
Desert Ironwood
Oxalis montana
Common Wood Sorrel, Mountain Woodsorrel, Wood Shamrock, White Woodsorrel, Wood Sorrel
Omphalotus illudens
Jack O'Lantern Mushroom
Oxalis stricta
Oxalis, Common Yellow Woodsorrel, Common Yellow Oxalis, Yellow Wood-Sorrel
Omphalotus olearius
Jack O’Lantern
Oxalis triangularis
Love Plant, Purple Shamrock, False Shamrock
Oncidium ‘Burgundy’
Dancing Lady
Oxalis violacea
Violet Wood Sorrel
Oncidium ‘Happy Valentine’
Dancing Lady
Oxydendrum arboreum
Sourwood
Oncidium ‘Rooster’
Oxypolis filiformis
Water Dropwort
Oncostele ‘Golden Red Star’
Orchid
Oxytropis
Onoclea sensibilis
Sensitive Fern, Bead Fern, Meadow Brake
Pachycereus marginatus
Mexican Fence Post Cactus, Organ Pipe Cactus, Mexican Fencepost
Operculicarya decaryi
Jabily, Elephant Tree
Pachycereus pringlei
Cardón, Cardón Gigante, Cardón Pelón, Sagueso, Sahuaso
Opuntia
Prickly Pear Cactus, Prickly Pear, Cholla
Pachycereus schottii
Señita Cactus, Old Man Cactus
Opuntia atrispina
Pachypodium lamerei
Madagascar Palm
Opuntia aurea
Creeping Beavertail, Yellow Beavertail
Pachysandra procumbens
Pachysandra, Alleghany Spurge, Alleghany Pachysandra
Opuntia basilaris var. basilaris
Beavertail Cactus
Pachysandra terminalis
Pachysandra, Japanese Spurge
Opuntia engelmannii
Engelmann Prickly Pear, Cactus Apple
Pachystachys lutea
Golden Shrimp Plant, Lollipop Plant
Opuntia engelmannii var. cuija
Tuna, Cactus Apple
Packera anonyma
Small’s Ragwort
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 glabella
Cressleaf Groundsel, Butterweed
Opuntia galapageia
Packera neomexicana
New Mexico Groundsel
Opuntia humifusa
Eastern Prickly Pear
Packera obovata
Running Groundsel
Opuntia laevis
Spineless Prickly Pear, Tulip Pricklypear
Packera paupercula
Northern Meadow Groundsel
Opuntia littoralis
Coast Prickly Pear, Sprawling Prickly Pear
Packera plattensis
Prairie Groundsel, Prairie Ragwort
Opuntia macrocentra
Long-spined Prickly Pear, Black Spine Prickly Pear, Purple Pricklypear
Paeonia
Peony
Opuntia macrorhiza var. macrorhiza
Plains Prickly Pear
Paeonia ‘Bartzella’
Peony
Opuntia microdasys ‘Alba’
White Polka Dot Cactus
Paeonia ‘Cora Louise’
Intersectional [Itoh] Peony
Opuntia microdasys ‘Monstrose’
Gold Swivel Cactus
Paeonia lactiflora ‘Hot Chocolate’
Common Garden Peony
Opuntia microdasys var. rufida
Cinnamon Cactus
Panax trifolius
Dwarf Ginseng
Opuntia phaeacantha
Desert Prickly Pear, Tulip Prickly Pear, Brown-spined Prickly Pear, Brown-spine Prickly Pear, Tulip Pricklypear
Pandanus tectorius
Hala, Screwpine, Tahitian Screwpine
Opuntia rufida
Prickly Pear Cactus
Pandanus utilis
Common Screwpine
Opuntia santa-rita
Santa Rita Purple Prickly Pear, Santa Rita Pricklypear
Panicum
Panicgrass
Opuntia spinosibacca
Panicum rigidulum
Redtop Panicgrass
Opuntia tortispina
Papaver rhoeas
Corn Poppy, Corn Rose, Field Poppy, Flanders Poppy, Red Poppy, Red Weed, Coquelicot
Orbea lutea subsp. lutea
Yellow Carrion Flower
Parietaria pensylvanica
Pennsylvania Pellitory
Orchidaceae
Paris quadrifolia
Herb Paris
Origanum ‘Kent Beauty’
Ornamental Oregano
Parkinsonia ‘Desert Museum’
Desert Museum Palo Verde
Origanum laevigatum ‘Herrenhausen’
Oregano
Parkinsonia aculeata
Mexican Palo Verde
Origanum vulgare ‘Aureum’
Golden Oregano
Parkinsonia florida
Blue Palo Verde, Blue Paloverde