[From Gardening with Old Roses, p. 16:] 1455-1485, between the House of York (represented by the White Rose of England, probably R. x alba) and the House of Lancaster (represented by the red rose, R. gallica officinalis). Peace was not restored until thirty years later, when the marriage of Henry Tudor and Elizabeth of York re-united the two sides and established the House of Tudor. The red and white Tudor Rose 'York and Lancaster', or R. x damascena versicolor, was then adopted as the royal emblem and is still used today.