​​Harisons Yellow 
What is a rose?
The American Rose Society (ARS) classifies roses into three main groups:

  1. Species Roses - wild roses
  2. Old Garden Roses - those that existed before 1867
  3. Modern Roses - those developed after 1867
 
The abbreviation following each class is used in the American Rose Society's "Handbook for Selecting Roses," available from the ARS. 
Genus Rosa
Veteran's Honor - HT