A white English rose
The most famous meanings of the white rose arise from mythology. Many of these surround Aphrodite (Venus) as Goddess of love. She sprang forth into life from the foaming sea, and where the foam fell to the ground, white roses grew. This and later myths about Aphrodite display the dual nature of love: purity and innocence represented by white roses; desire and sexual gratification by red ones. In one story she runs to help her wounded lover Adonis and catches her flesh on the thorns of the white rose bush. Her blood falling on the bush turns the roses red, symbolizing the way innocence and purity change to experience and motherhood.
From The Meaning of Roses website