There are quite a few species of Xanthorrhoea. These magnificant specimens from the Brisbane Ranges just outside of Melbourne, are probably X. australis. One of my gardening books describes the grass like leaves which crowd together at the top of the dark rough trunk as looking like the skirt of a hula dancer. This very slow growing plant produces creamy flowers on the spike which can be up to 2 metres high. Often the best flower shows are after bushfires have swept through an area. The grass tree is very susceptible to a nasty introduced disease - Cinnamon fungus - which can devastate whole areas of them.
Grass trees make a lovely print - dancing across the fabric. It is worth the hours and hours of stencil cutting.