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Do you have a citation for that? ‘Cause [according to wikipedia:](http://en.wikipedia.org/wiki/Papaver_somniferum#Varieties_and_cultivars)
>Papaver somniferum has many subspecies or varieties and cultivars. Colors of the flower vary widely, as do other physical characteristics, such as number and shape of petals, number of flowers and fruits, number of seeds, color of seeds, production of opium, etc.
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>Most varieties, however, including those most popular for ornamental use or seed production, have a higher morphine content, with the average content being 10%