Requiescat (meaning 'rest in peace') is a poem by Matthew Arnold written in 1853.
Strew on her roses, roses,
And never a spray of yew!
In quiet she reposes;
Ah, would that I did too!
Yew trees are often planted in church yards, and can be seen as a symbol of sorrow or death. Sprays are sometimes placed on coffins to symbolise resurrection and eternal life.