What's on the book shelves (so far)...
"Hebes. A Guide to Species, Hybrids, and Allied Genera"
by Lawrie Metcalf, 2006, Timber Press
by Lawrie Metcalf, 2001, Royal NZ Inst. of Hort.
1997, Hutchins and Davies
"Sustainable Gardens" by Rob Cross &
Roger Spencer, 2009. CSIRO Publishing.