In China, roses are considered a symbol of assassins and knights because of their thorny branches and stems. In the West, roses are regarded as a symbol of strictly guarded secrets. When visiting the hosts house and seeing a rose painted on top of the table, they understand that nothing discussed on this table can be disclosed, so Sub rosa - "under the rose" is born. Under the flowers" is a Latin idiom.
Illustrated tutorial for handmade origami AP roses. The flower shape is very beautiful, close to a wine glass rose. If you are interested, try it~