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A poppy is any of a number of showy flowers, typically with one per stem, belonging to the poppy family. They include a number of attractive wildflower species with showy flowers found growing singularly or in large groups; many species are also grown in gardens. Those that are grown in gardens include large plants used in a mixed herbaceous boarder and small plants that are grown in rock or alpine gardens.
The flower color of poppy species include: white, pink, yellow, orange, red and blue; some have dark center markings. The species that have been cultivated for many years also include many other colors ranging from dark solid colors to soft pastel shades. The center of the flower has a whorl of stamens surrounded by a cup- or bowl-shaped collection of four to six petals. Prior to blooming, the petals are crumpled in bud, and as blooming finishes, the petals often lie flat before falling away.
Poppies may be found in the genera:
The pollen of the oriental poppy, Papaver orientale, is dark blue. The pollen of the field poppy or corn poppy (Papaver rhoeas) is dark blue to grey. Bees will use poppies as a pollen source.
The opium poppy, Papaver somniferum, is grown for opium, opiates or seeds to be used in cooking and baking, eg., Hungarian poppy seed rolls.
Poppies have long been used as a symbol of both sleep and death: sleep because of the opium extracted from them, and death because of their (commonly) blood-red color. In Greco-Roman myths, poppies were used as offerings to the dead. Poppies are used as emblems on tombstones to symbolize eternal sleep. This aspect was used, fictionally, in The Wonderful Wizard of Oz to create magical poppy fields, dangerous because they caused those who passed through them to sleep forever.
A second meaning for the depiction and use of poppies in Greco-Roman myths is the symbolism of the bright scarlet colour as signifying the promise of resurrection after death. 
The poppy of wartime remembrance is the red corn poppy, Papaver rhoeas. This poppy is a common weed in Europe and is found in many locations, including Flanders Fields. This is because the corn poppy was one of the only plants that grew on the battlefield. It thrives in disturbed soil, which was abundant on the battlefield due to intensive bombing. During the few weeks the plant blossomed, the battlefield was coloured blood red, not just from the red flower that grew in great numbers but also from the actual blood of the dead soldiers and civilians that lay scattered and untended to on the otherwise barren battlegrounds. Thus the plant became a symbol for the dead World War I soldiers. In many Commonwealth countries, artificial, paper versions of this poppy are worn to commemorate the sacrifice of veterans and civilians in World War I and other wars, during the weeks preceding Remembrance Day on November 11. It has been adopted as a symbol by The Royal British Legion in their Poppy Appeal.