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
  • Anonymous. 1986. List-Based Rec., Soil Conserv. Serv., U.S.D.A. Database of the U.S.D.A., Beltsville.   http://www.tropicos.org/Reference/1103 External link.
  • Apocynaceae of North America Update
  • CONABIO. 2009. Catálogo taxonómico de especies de México. 1. In Capital Nat. México. CONABIO, Mexico City.   http://www.tropicos.org/Reference/1033332 External link.
  • Correll, D. S. & M. C. Johnston. 1970. Man. Vasc. Pl. Texas i–xv, 1–1881. The University of Texas at Dallas, Richardson.   http://www.tropicos.org/Reference/1493 External link.
  • Fernald, M. 1950. Manual (ed. 8) i–lxiv, 1–1632. American Book Co., New York.   http://www.tropicos.org/Reference/1327 External link.
  • Great Plains Flora Association. 1986. Fl. Great Plains i–vii, 1–1392. University Press of Kansas, Lawrence.   http://www.tropicos.org/Reference/637 External link.
  • Kaul, R. B., S. B. Rolfsmeier & J. J. Esch. 1991. The distribution and reproductive phenology of the milkweeds (Asclepiadaceae: Asclepias and Cynanchum in Nebraska. Trans. Nebraska Acad. Sci. 18: 127–140.   http://www.tropicos.org/Reference/45681 External link.
  • 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.
  • SPECIMEN BASED RECORD. Published protolog data.   http://www.tropicos.org/Reference/9990002 External link.
  • Woodson, J. R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.   http://www.tropicos.org/Reference/7133 External link.

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