Manual of Cultivated Plants Most Commonly Grown in the Continental United States and

Canada by L. H. Bailey (New York: Macmillan, 1949).

Sunset Western Garden Book by Kathleen Norris Brenzel (Birmingham, AL: Oxmoor House, 2007).

Horticultural Flora of South Eastern Australia by Roger Spencer and Su Pearson (Sydney: Univ. of New South Wales Press, 2002).

Mabberley’s Plant-Book by D. J. Mabberley (New York: Cambridge Univ. Press, 1997).

The Jepson Manual, Vascular Plants of California by Bruce Baldwin editor (Berkeley: Univ. of California Press, 2012).

Stearn's Dictionary of Plant Names for Gardeners by William T. Stearn (Portland: Timber Press, 1996).

Plant Systematics by Michael G. Simpson (New York: Academic Press, 2010).

Plant Form: An Illustrated Guide to Flowering Plant Morphology by Adrian D. Bell (Portland: Timber Press,2008).

Plant Names: A Guide to Botanical Nomenclature by Roger Spencer, Rob Cross, Peter Lumley (Canberra: CSIRO Publishing, 2007)