Orbea semota
Orbea speciosa
Orchidanthera maxillarioides
Orchis anatolica
Orchis anthropophorum
Orchis brancifortii
Orchis comara
Orchis ichnusiae
Orchis italica
Orchis longicornu
Orchis mascula
Orchis olbiensis
Orchis pauciflora
Orchis principalis
Orchis provincialis
Orchis quadripunctata
Orchis quadripunctata f. albiflora
Orchis simia
Oreocereus celsianus
Oreocereus doelzianus
Oreocereus fossulatus
Oreocereus pseudofossulatus
Oreocereus ritteri
Oreocereus trollii
Oreocereus trollii f. major 'Cristata'
Oreocereus urumiensis
Oreopanax andreanus
Oreopanax dactylifolius
Oreopanax echinops
Oreopanax floribundus
Oreopanax peltatus
Oreopanax xalapensis
Oresitrophe rupifraga
Origanum amanum
Origanum 'Barbara Tingey'
Origanum 'Bristol Cross'
Origanum 'Buckland'
Origanum calcaratum
Origanum dictamnus
Origanum dictamnus 'Kotsifou'
Origanum (dictamnus x calcaratum)
Origanum ecalcaratum
Origanum 'Kent Beauty'
Origanum laevigatum 'Herrenhausen'
Origanum laevigatum 'Hopleys'
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Origanum 'Norton Gold'
Origanum 'Rosenkuppel'
Origanum rotundifolium
Origanum tournefortii
Origanum vulgare 'Aureum'
Origanum vulgare 'County Cream'
Origanum vulgare ssp. hirtum
Orixa japonica
Orixa japonica 'Variegata'
Orlaya grandiflora
Ornithidium coccineum
Ornithocephalus bryostachys
Ornithocephalus dalstroemii
Ornithocephalus falcatus
Ornithocephalus manabina
Ornithogalum balansae
Ornithogalum balansae 'White Trophy'
Ornithogalum ciliiferum
Ornithogalum concinnum
Ornithogalum dubium
Ornithogalum exscapum
Ornithogalum fimbriatum
Ornithogalum fimbriatum 'Al Petri'
Ornithogalum fimbriatum 'Oreanda'
Ornithogalum fimbrimarginatum
Ornithogalum lanceolatum
Ornithogalum maculatum
Ornithogalum magnum
Ornithogalum montanum platyphyllum
Ornithogalum nanum
Ornithogalum narbonense
Ornithogalum orthophyllum
Ornithogalum pyramidata
Ornithogalum pyrenaicum
Ornithogalum pyrenaicum Flavescens Group
Ornithogalum refractum
Ornithogalum reverchonii
Ornithogalum saundersiae
Ornithogalum schmalhausenii
Ornithogalum sibthorpii
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Ornithogalum sigmoideum
Ornithogalum sintenisii
Ornithogalum tenuifolium
Ornithogalum thyrsoides
Ornithogalum troodii
Ornithogalum umbellatum
Ornithogalum wiedemannii
Ornithophora radicans
Orobanche hederae
Orostachys 'Chinese Hat'
Orostachys spinosa
Orostachys spinosa Green Flower
Oroya aureiflora
Oroya neoperuviana
Oroya peruviana
Oroya subocculata
Orphium frutescens
Ortegocactus macdowellii
Orthophytum glabrum
Orthophytum grossiorum
Orthophytum gurkenii
Orthophytum horridum
Orthophytum saxicola
Orthophytum vagans
Orthopterum coeganum
Orthrosanthus multiflorus
Oryza sativa
Osbeckia stellata
Oscularia deltoides
Osmanthus americanus var. megacarpus
Osmanthus armatus
Osmanthus x burkwoodii
Osmanthus decorus
Osmanthus delavayi
Osmanthus delavayi 'Frank Knight'
Osmanthus delavayi latifolia
Osmanthus heterophyllus 'Aureomarginatus'
Osmanthus heterophyllus 'Goshiki'
Osmanthus heterophyllus 'Gulf Tide'
Osmanthus heterophyllus 'Myrtifolius'
Osmanthus heterophyllus 'Rotundifolius'
Osmanthus heterophyllus 'Sasaba'
Osmanthus heterophyllus 'Variegatus'
Osmanthus serrulatus
Osmanthus yunnanensis
Osmoglossum pulchellum
Osmunda cinnamomea
Osmunda (gracilis x regalis)
Osmunda javanica
Osmunda regalis
Osmunda regalis 'Crispa'
Osmunda regalis 'Cristata'
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Osmunda regalis 'Purpurascens'
Osmunda vachellii
Osteospermum 'African Summer'
Osteospermum 'Akream' ORANIA CREAM
Osteospermum 'Askullo' NASINGA PURPLE
Osteospermum 'Balostlueye' BLUE EYED BEAUTY
Osteospermum 'Balvoyelo' VOLTAGE YELLOW
Osteospermum 'Cannington John'
Osteospermum 'Cannington Katrina'
Osteospermum 'Cannington Roy'
Osteospermum caulescens
Osteospermum 'Chris Brickell'
Osteospermum 'Dark Eyes'
Osteospermum ecklonis
Osteospermum ecklonis 'Prostrata'
Osteospermum 'Giles Gilbey'
Osteospermum 'Hardy Pink'
Osteospermum hyoseroides
Osteospermum 'John Lanyon'
Osteospermum jucundum
Osteospermum jucundum 'Compactum'
Osteospermum 'La Mortola'
Osteospermum 'Lady Leitrim'
Osteospermum 'Mary'
Osteospermum 'Nairobi Purple'
Osteospermum 'Paleface'
Osteospermum 'Pink Whirls'
Osteospermum 'Serenity Blushing Beauty'
Osteospermum 'Serenity Red'
Osteospermum 'Snow Pixie'
Osteospermum 'Stardust'
Osteospermum 'Summertime Blueberry'
Osteospermum 'Summertime Bronze Charm'
Osteospermum 'Summertime Royal Purple'
Osteospermum 'Summertime Sunset'
Osteospermum 'Sunny Amanda'
Osteospermum 'Sunny Bronza'
Osteospermum 'Sunny Cecil'
Osteospermum 'Sunny Mary'
Osteospermum 'Terracotta'
Osteospermum 'Trewidden Pink'
Osteospermum vaillantii
Osteospermum 'White Pim'
Ostrowskia magnifica
Ostrya carpinifolia
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