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Opium. Poppy (Papaver somniferum), a 120cm tall, summer-flowering annual, originally from western Asia. The conspicuous seed heads are the source of opium, which is derived from the milky sap of the green heads, and of edible poppy seed, which is harvested from the mature heads. Typically a light purple-mauve, the flowers cover a range of red and purple shades. Order: Ranunculales