Silphium radula var. gracile (A. Gray) Clevinger

Chicago citation style
Silphium radula var. gracile (A. Gray) Clevinger. 11 Jul 1915. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmnhbotany_12994984&repo=DPLA. (Accessed December 12, 2018.)
APA citation style
(11 Jul 1915) Silphium radula var. gracile (A. Gray) Clevinger. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmnhbotany_12994984&repo=DPLA
MLA citation style
Retrieved from the Digital Public Library of America <http://collections.si.edu/search/results.htm?q=record_ID%3Anmnhbotany_12994984&repo=DPLA>.
Note: These citations are programmatically generated and may be incomplete.