Thomisidae (family) (Unidentified Crab spider or Flower spider)
For flower spiders within Thomisidae (i.e. Australomisidia sp., Lehtinelagia sp., Tharrhalea sp.):
http://www.arachne.org.au/01_cms/details.asp?ID=2299
Flower spiders are diurnal and are common on Australian native flowers such as grevilleas and wattles. They are territorial with only one spider occupying a flower, unless they are male and female come together for mating. The occupant will often sit on a flower until the petals wilt before moving onto another flower. At night flower spiders hide under the petals or leaves. (www.amonline.net.au)
