Polygala myrtifolia

This is a bush in our garden that I have not blipped before. It is also known as Bellarine pea, myrtle leaf milkwort, myrtle-leafed milkweed, parrot bush, polygala, September bush, sweet pea bush or sweet pea shrub.
It is a native to southern Africa and grows very well in southern Australia.

It is widely cultivated as a garden ornamental in the Adelaide area.