Most of us no doubt get the significance of the poppy, but if not:

Lt. Colonel John McCrae M.D. "In Flanders Fields", written after the 2nd Battle of Ypres during which the Germans used chlorine gas on the Canadian line April 22, 1915:

In Flanders fields
the poppies blow
Between the crosses, row on row,
That mark our place;
and in the sky The larks, still bravely singing,
fly Scarce heard amid the guns below.
We are the Dead.
Short days ago
We lived, felt dawn, saw sunset glow,
Loved and were loved, and now we lie
In Flanders fields.
Take up our quarrel with the foe:
To you from failing hands we throw
The torch; be yours to hold it high.
If ye break faith with us who die
We shall not sleep, though poppies grow
In Flanders fields.