Sicilian Buttercups were admitted to the American Standard of Perfection in 1918, but were present in America considerably earlier. Here is a link to an enlightening article about judging buttercups that was printed in 1929:
http://www.geocities.ws/americanbuttercupclub/judgingbuttercups.html
This article is posted on the website of the American Buttercup Club.
http://www.geocities.ws/americanbuttercupclub/judgingbuttercups.html
This article is posted on the website of the American Buttercup Club.