About Year of Release or Introduction:
      -------------------------------------
      Indicates the year that the cultivar was initially available for 
      production in the United States.  Years prefixed with a "<" indicate
      the cultivar was known to have been introduced or grown prior to the
      time indicated, but the exact year of release or introduction is not
      known.  In this instance, the year indicate the initial occurrence of
      documented evidence for the cultivar.