Odontonema strictum * Fire Spike
Oenothera elata hookeri * Hooker's Evening Primrose
Oenothera missouriensis * Evening Primrose
Oenothera speciosa * Mexican Evening Primrose
Origanum dictamnus * Crete Dittany
Origanum Hopley's Purple
Origanum Kaliteri * Greek Oregano
Origanum rotundifolium Kent Beauty
Orthocarpus purpurascens * Purple Owl's Clover
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Ophiopogon japonicus nana * Dwarf Mondo Grass
Ophiopogon planiscapus nigescens * Black Mondo Grass
Oscularia deltoides * Pink Iceplant
Osmanthus fragrans * Sweet Olive
Osteospermum fruticosum * Freeway Daisy
Oxalis oregana * Redwood Sorrel
Oxalis regnellii rubra * Wood Sorrell
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