References:

CNPS, Rare Plant Program (2014) Inventory of Rare and Endangered Plants (online edition, v8-02). California Native Plant Society, Sacramento, CA. Website http://www.rareplants.cnps.org [accessed 13 May 2014].

Explanations of the rarity rankings used by CNPS may be found at http://www.rareplants.cnps.org/glossary.html#globalrank

Harrison, S. P. (2013). Plant and Animal Endemism in California. Univ of California Press.

Imada, C. (2012) Hawaiian Native and Naturalized Vascular Plants Checklist (December 2012 update). Bishop Museum Technical Report 60. Bishop Museum, Honolulu, HI.

Jepson Flora Project (B. G. Baldwin, D. J. Keil, S. Markos, B. D. Mishler, R. Patterson, T. J. Rosatti, and D. H. Wilken, eds.) (2015) Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on May 8, 2015]

Kartesz, J.T., The Biota of North America Program (BONAP) (2015) Taxonomic Data Center. (http://www.bonap.net/tdc). Chapel Hill, N.C. (accessed 10 May 2015)

Myers, N., Mittermeier, R.A., Mittermeier, C.G., Da Fonseca, G.A. and Kent, J. (2000) Biodiversity hotspots for conservation priorities. Nature, 403(6772): 853-858.

USDA, NRCS. 2015. The PLANTS Database (http://plants.usda.gov, 8 May 2015). National Plant Data Team, Greensboro, NC 27401-4901 USA.