United States Code
TITLE 36 - PATRIOTIC SOCIETIES AND OBSERVANCES
CHAPTER 10 - PATRIOTIC CUSTOMS

§ 187. National floral emblem

The flower commonly known as the rose is designated and adopted as the national floral emblem of the United States of America, and the President of the United States is authorized and requested to declare such fact by proclamation.

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(Material above downloaded from http://www.law.cornell.edu/uscode/36/187.html)