The Black Rose

The Symbolic Color of Roses:

Black Rose: In the 18th century, the language of flowers became popular. In this code, black roses to most people signify death, or hatred. But it also means farewell. Black rose means revenge to a foe or wanting to kill someone. However, because a black rose is virtually impossible to procure, it can also mean pure love. A black rose can also mean rebirth, though this is less known.

http://en.wikipedia.org/wiki/Black_rose_(symbolism)