Silphium asteriscus var. asperrimum (Hook.) Clevinger

Chicago citation style
Silphium asteriscus var. asperrimum (Hook.) Clevinger. 7 Aug 1900. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmnhbotany_12994944&repo=DPLA. (Accessed November 21, 2018.)
APA citation style
(7 Aug 1900) Silphium asteriscus var. asperrimum (Hook.) Clevinger. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmnhbotany_12994944&repo=DPLA
MLA citation style
Retrieved from the Digital Public Library of America <http://collections.si.edu/search/results.htm?q=record_ID%3Anmnhbotany_12994944&repo=DPLA>.
Note: These citations are programmatically generated and may be incomplete.