The remembrance poppy (a "Papaver rhoeas") has been used since 1921 to commemorate those who died in WW1 (1914-1918) by the United Kingdom, Canada, Australia and New Zealand.
The remembrance poppy (a "Papaver rhoeas") has been used since 1921 to commemorate those who died in WW1 and to marke the WW1 armistice day. They were then adopted by military veterans' groups in the United Kingdom, Canada, Australia and New Zealand.