Sources:

-APG III, 2009, An Update of the Angiosperm Phylogeny Group Classification for the Orders and Families of Flowering Plants.
-Biology 321 Course Website - http://www3.botany.ubc.ca
-Euzomo - http://euzomo.es/flora
-The Tree of Life - http://www.tolweb.org
-The Tree of Life, A Phylogenetic Classification, Guillaume Lecointre and Hervé Le Gullader, 2006
-Wikipedia - http://en.wikipedia.org/wiki/Welwitschia

Citation: García, A.I. 2015. The Tree Of Nature (Online) at http://thetreeofnature.com

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