Herbs with botanical name beginning with: o              
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Ochrosia elliptica- Bloodhorn
Ocimum basilicum-  Basil      
Ocimum tenuiflorum, Ocimum sanctum var. angustifolium-  Holy basil
Oenanthe aquatica- Water fennel
        "       crocata- Hemlock water dropwort
        "       javanica  
Oenothera biennis- Evening Primrose
Oldenlandia diffusa    
Olea europea- Olive   
Omphalia lapidescens
Ononis spinosa- Spiny rest harrow
Onychium japonicum 
Operculina turpethum- Turpeth
Ophioglossum vulgatum  
Ophipogon japonicus- Mai dong
Opuntia species
Orchis mascula and O. militaris- Used in production of Turkish drink Salep
Origanum marjorana- Marjoram    
Origanum vulgare- Oregano  
Oris aries- Common sheep
Orobanche coerulescens- Broomrape
Orostachys fimbriatus
Oroxylum indicum- Oroxylum, Indian trumpet flower
Orthodon fordu, see Mosla chinensis
Oryza sativa- Rice
Osbeckia chinensis
Osbeckia crinita
Osmunda japonica
Ostrea edulis see Ostreidae- family
Ostreidae- family- Ostrea gigas- Oyster
Owenia acidula- Emu apple
Oxalis acetosella- Woodsorrel
    "      corniculata- Creeping woodsorrel
Oxytropis chiliophylla