Silphium perfoliatum var. perfoliatum

Chicago citation style
Silphium perfoliatum var. perfoliatum. 20 Aug 1947. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmnhbotany_12996341&repo=DPLA. (Accessed November 12, 2018.)
APA citation style
(20 Aug 1947) Silphium perfoliatum var. perfoliatum. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmnhbotany_12996341&repo=DPLA
MLA citation style
Retrieved from the Digital Public Library of America <http://collections.si.edu/search/results.htm?q=record_ID%3Anmnhbotany_12996341&repo=DPLA>.
Note: These citations are programmatically generated and may be incomplete.