Onion Opium

Oak see Quercus spp Oat see Avena sativa Oil palm—W. African see Elaeis guineensis Onion see Allium cepa Onobrychis sativa 233 Opium poppy see Papaver somniferum Opuntia 13 Orchids 7, 10, 13, 14 Oropetium thomaeum 126 Oryza sativa (rice) 2, 19, 23-31, 48, 52, 55, 133, 136, 151, 154, 179, 186-189, 223-228, 235, 269, 271-273... 

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