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


  • Anonymous. 1986. List-Based Rec., Soil Conserv. Serv., U.S.D.A. Database of the U.S.D.A., Beltsville.
  • 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.
  • Govaerts R. (ed). For a full list of reviewers see: (2015). WCSP: World Checklist of Selected Plant Families (version Sep 2014). In: Species 2000 & ITIS Catalogue of Life, 26th August 2015 (Roskov Y., Abucay L., Orrell T., Nicolson D., Kunze T., Flann C., Bailly N., Kirk P., Bourgoin T., DeWalt R.E., Decock W., De Wever A., eds). Digital resource at Species 2000: Naturalis, Leiden, the Netherlands. ISSN 2405-8858.
  • Proceedings of the American Academy of Arts and Sciences 14: 247. 1879. (Proc. Amer. Acad. Arts)
  • S.Watson. 1879. In: Proc. Amer. Acad. Arts 14: 247
  • Shreve, F. & I. L. Wiggins. 1964. Veg. Fl. Sonoran Des. 2 vols. Stanford University Press, Stanford.
  • Type collection: Watson, S. 1879. Proc. Amer. Acad. Arts. 14: 247.


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