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Oenothera 'Blood Orange'
Oenothera fruticosa 'Camel' (v)
Oenothera fruticosa subsp. glauca AGM
Oenothera fruticosa subsp. glauca 'Erica Robin' (v)
Oenothera macrocarpa subsp. fremontii 'Silver Wings'
Oenothera speciosa 'Siskiyou'
Oenothera speciosa 'Woodside White'
Oenothera stricta 'Sulphurea'
Omphalodes cappadocica 'Cherry Ingram' AGM
Omphalodes cappadocica 'Starry Eyes'
Omphalodes verna 'Alba'
Omphalodes verna 'Elfenauge'
Ononis spinosa
Ophiopogon planiscapus 'Nigrescens' AGM
Origanum majorana PAGODA BELLS 'Lizbell' (PBR)
(other names: Origanum majorana 'Lizbell' (PBR) (accepted), Origanum rotundifolium 'Pagoda Bells' (PBR) (syn))
Origanum 'Norton Gold'
Ornithogalum umbellatum
Orthrosanthus polystachyus
Osteospermum 'Almach' (PBR) (Springstar Series)
Osteospermum BANANA SYMPHONY 'Sekiin47' (Symphony Series)
(other names: Osteospermum 'Banana Symphony' (syn), Osteospermum 'Sekiin47' (accepted))
Osteospermum 'Gold Sparkler' (v)
Osteospermum 'Irish'
Osteospermum jucundum (Phillips) Norlindh AGM
Osteospermum jucundum 'Langtrees' AGM
Osteospermum jucundum var. compactum
Osteospermum 'Nairobi Purple'
Osteospermum ORANGE SYMPHONY 'Seimora' (PBR) (Symphony Series)
(other names: Osteospermum 'Symphony Orange' (PBR) (syn), Osteospermum 'Orange' (PBR) (syn), Osteospermum 'Seimora' (PBR) (accepted))
Osteospermum 'White Pim' AGM
Oxalis 'Black Velvet' (Xalis Series)
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