Silphium asteriscus L. var. asteriscus

Chicago citation style
Silphium asteriscus L. var. asteriscus. 23 Jul 1866. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmnhbotany_12992553&repo=DPLA. (Accessed November 19, 2018.)
APA citation style
(23 Jul 1866) Silphium asteriscus L. var. asteriscus. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmnhbotany_12992553&repo=DPLA
MLA citation style
Retrieved from the Digital Public Library of America <http://collections.si.edu/search/results.htm?q=record_ID%3Anmnhbotany_12992553&repo=DPLA>.
Note: These citations are programmatically generated and may be incomplete.