Silphium asteriscus var. asperrimum (Hook.) Clevinger

Chicago citation style
Silphium asteriscus var. asperrimum (Hook.) Clevinger. 1878. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmnhbotany_12987432&repo=DPLA. (Accessed November 14, 2018.)
APA citation style
(1878) 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_12987432&repo=DPLA
MLA citation style
Retrieved from the Digital Public Library of America <http://collections.si.edu/search/results.htm?q=record_ID%3Anmnhbotany_12987432&repo=DPLA>.
Note: These citations are programmatically generated and may be incomplete.