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

References

  • Ames, O. & D. S. Correll. 1952. Orchids of Guatemala. Fieldiana, Bot. 26(1): i–xiii, 1–395.
  • Anonymous. 1986. List-Based Rec., Soil Conserv. Serv., U.S.D.A. Database of the U.S.D.A., Beltsville.
  • Boston Journal of Natural History 5(2): 236. 1845. (Boston J. Nat. Hist.)
  • Breedlove, D.E. 1986. Flora de Chiapas. Listados Floríst. México 4: i–v, 1–246.
  • CONABIO. 2009. Catálogo taxonómico de especies de México. 1. In Capital Nat. México. CONABIO, Mexico City.
  • Correll, D. S. & M. C. Johnston. 1970. Man. Vasc. Pl. Texas i–xv, 1–1881. The University of Texas at Dallas, Richardson.
  • Encyclopédie Méthodique, Botanique 4: 567. 1789. (Encycl.)
  • Engelm. & A.Gray. 1845. In: Boston J. Nat. Hist. 5: 236
  • Fernald, M. 1950. Manual (ed. 8) i–lxiv, 1–1632. American Book Co., New York.
  • Flora Boreali-Americana 2: 157. 1803. (Fl. Bor.-Amer.)
  • Gleason, H. A. & A.J. Cronquist. 1991. Man. Vasc. Pl. N.E. U.S. (ed. 2) i–910. New York Botanical Garden, Bronx.
  • Govaerts R. (ed). For a full list of reviewers see: http://apps.kew.org/wcsp/compilersReviewers.do (2013). WCSP: World Checklist of Selected Plant Families (version Oct 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.
  • Great Plains Flora Association. 1986. Fl. Great Plains i–vii, 1–1392. University Press of Kansas, Lawrence.
  • Hilty, J. Editor. 2014. Insect Visitors of Illinois Wildflowers.  World Wide Web electronic publication. illinoiswildflowers.info, version (07/2014) 
    See:   Abbreviations for Insect ActivitiesAbbreviations for Scientific ObserversReferences for behavioral observations
  • Image metadata at Bioimages (http://bioimages.vanderbilt.edu/)   http://bioimages.vanderbilt.edu/baskauf/00000 External link.
  • Long, R. W. & O. K. Lakela. 1971. Fl. Trop. Florida i–xvii, 1–962. University of Miami Press, Coral Cables.
  • 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.
  • Revisio Generum Plantarum 2: 664. 1891. (5 Nov 1891) (Revis. Gen. Pl.)
  • Type collection: Small, J. K. 1898. Bull. Torrey Bot. Club. 25: 610.
  • WoRMS (2014). Spiranthes vernalis Engelmann & A. Gray, 1845. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=418800
  • Wunderlin, R. P. 1998. Guide Vasc. Pl. Florida i–x, 1–806. University Press of Florida, Gainesville.

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