Helianthus subrhomboideus Rydb

Chicago citation style
Helianthus subrhomboideus Rydb. 1 Sep 1922. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmnhbotany_12808596&repo=DPLA. (Accessed November 16, 2018.)
APA citation style
(1 Sep 1922) Helianthus subrhomboideus Rydb. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmnhbotany_12808596&repo=DPLA
MLA citation style
Retrieved from the Digital Public Library of America <http://collections.si.edu/search/results.htm?q=record_ID%3Anmnhbotany_12808596&repo=DPLA>.
Note: These citations are programmatically generated and may be incomplete.