The following bibliography has been generated by bringing together all references provided by our content partners. There may be duplication.

References

  • 1996. database, NODC Taxonomic Code
  • 1996. database, The PLANTS Database
  • 2000. database, The PLANTS Database
  • 2011. Lamiales of North America Update
  • CONABIO. 2009. Catálogo taxonómico de especies de México. 1. In Capital Nat. México. CONABIO, Mexico City.
  • Fernald, M. 1950. Manual (ed. 8) i–lxiv, 1–1632. American Book Co., New York.
  • Flora of the Southeastern United States 1060, 1337. 1903. (22 Jul 1903) (Fl. S.E. U.S.)
  • Gleason, H. A. & A.J. Cronquist. 1991. Man. Vasc. Pl. N.E. U.S. (ed. 2) i–910. New York Botanical Garden, Bronx.
  • Gleason, H. A. 1968. The Sympetalous Dicotyledoneae. vol. 3. 596 pp. In H. A. Gleason Ill. Fl. N. U.S. (ed. 3). New York Botanical Garden, New York.
  • Great Plains Flora Association. 1986. Fl. Great Plains i–vii, 1–1392. University Press of Kansas, Lawrence.
  • Hilty, J. Editor. 2014. Illinois Wildflowers. World Wide Web electronic publication. flowervisitors.info, version 06/2014.
    See: Botanical Terminology and Line DrawingsEcological TerminologyWebsite DescriptionLinks to Other WebsitesReference Materials
  • Hilty, J. Editor. 2014. Insect Visitors of Illinois Wildflowers.  World Wide Web electronic publication. illinoiswildflowers.info, version (11/2014) 
    See:   Abbreviations for Insect ActivitiesAbbreviations for Scientific ObserversReferences for behavioral observations
  • Isotype: Pennell, F. W. 1922. Proc. Acad. Nat. Sci. Philadelphia. 73: 494.
  • Isotype: Pennell, F. W. 1935. Acad. Nat. Sci. Philadelphia Monogr. 1: 227.
  • Orrell T. (custodian) (2013). ITIS Regional: The Integrated Taxonomic Information System (version Apr 2011). In: Species 2000 & ITIS Catalogue of Life, 11th March 2013 (Roskov Y., Kunze T., Paglinawan L., Orrell T., Nicolson D., Culham A., Bailly N., Kirk P., Bourgoin T., Baillargeon G., Hernandez F., De Wever A., eds). Digital resource at www.catalogueoflife.org/col/. Species 2000: Reading, UK.
  • Radford, A. E., H. E. Ahles & C. R. Bell. 1968. Man. Vasc. Fl. Carolinas i–lxi, 1–1183. University of North Carolina Press, Chapel Hill.
  • Small, J. K. 1933. Man. S.E. Fl. i–xxii, 1–1554. Published by the Author, New York.
  • Voss, E. G. 1996. Michigan Flora, Part III: Dicots (Pyrolaceae-Compositae). Cranbrook Inst. of Science, Ann Arbor.

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