I thought it was Purple, but they say it's Mauve or sometimes Pink. Polygala myrtifolia is sometimes called by the common names "Milkwort" or "Sweet Pea Bush". This time of year in Sydney, there are some nice examples of this plant to see around. This is a fast growing , medium sized shrub, growing up to 2 metres, and it puts on a glorious display of Mauve flowers. It is best planted in full sun and suited for temperate or warm climates. There are some dwarf hybrids available which are suitable for either pots or garden planting, and some prefer these as the regular variety is considered a weed in some places.
These photos were taken in Sydney's Nothern Suburbs.