The Tudor rose is a symbol of the union of the houses of Lancaster and York in the dynasty of the Tudors.
After the Battle of Bosworth Field Richard III lost. 1485 The English crown to Henry Tudor, who then became Henry VII. Henry married Elizabeth of York, the niece Richards, ending the Wars of the Roses.
The white rose was the symbol of the House of York and the red rose asked the House of Lancaster dar. In the Tudor rose, the two united in a red rose with white center.
The Tudor Rose is still a symbol of England and appears for instance in the arms of the United Kingdom and in the coat of arms of Canada. The United States Army Institute of Heraldry recalls with the Tudor rose in his coat of arms to the settlement of North America from England during the Tudor period.
By using crest in this rose is a simple symbol addition, a common figure in heraldry.