1. United States Dispensatory, 24th edition [Arthur Osol and George F. Farrar, editors] J. B. Lippincott Company, 1947; 26th edition [Author Osol, Robertson Pratt and Mark D. Altschule, editors] J. B. Lippincott Company, 1967.
2. House, Homer Doliver. 1908. The North American Species of the Genus Ipomoea. Ann. N. Y. Acad. Sci.18: 181–263, illus.
3. Matuda, Eizi. 1965. El Género Ipomoea en México. An. Inst. Biol.34: 85–145.
4. Matuda, Eizi. 1965. El Género Ipomoea en México. An. Inst. Biol.34: 85–145. 1964;35: 45-76. 1965;36: 83-106.
5. Standley, Paul C. & Louis O. Williams. Fieldiana, Bot.24, pt. IX: 1–88,illus. 1970.