Cirsium tracyi (Rydb.) Petr

Chicago citation style
Cirsium tracyi (Rydb.) Petr. 2 Sep 1937. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmnhbotany_12972238&repo=DPLA. (Accessed December 14, 2018.)
APA citation style
(2 Sep 1937) Cirsium tracyi (Rydb.) Petr. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmnhbotany_12972238&repo=DPLA
MLA citation style
Retrieved from the Digital Public Library of America <http://collections.si.edu/search/results.htm?q=record_ID%3Anmnhbotany_12972238&repo=DPLA>.
Note: These citations are programmatically generated and may be incomplete.