Cassinia denticulata, the Stiff Cassinia is a common plant growing in Sydney

Sydney

Sydney is the most populous city in Australia and the state capital of New South Wales. Sydney is located on Australia's south-east coast of the Tasman Sea. As of June 2010, the greater metropolitan area had an approximate population of 4.6 million people...

 and the Blue Mountains. Found on sandstone

Sandstone

Sandstone is a sedimentary rock composed mainly of sand-sized minerals or rock grains.Most sandstone is composed of quartz and/or feldspar because these are the most common minerals in the Earth's crust. Like sand, sandstone may be any colour, but the most common colours are tan, brown, yellow,...

 based soils in heathland or woodland. The original specimen was collected at Sydney, Australia

Australia

Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...

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A shrub growing to a metre or two tall. Leaves are stiff, with toothed edges, whitish underneath. Yellow flowers form on silvery white bract

Bract

In botany, a bract is a modified or specialized leaf, especially one associated with a reproductive structure such as a flower, inflorescence axis, or cone scale. Bracts are often different from foliage leaves. They may be smaller, larger, or of a different color, shape, or texture...

s in spring. The common epithet “denticulata” refers to the toothed edges of the leaves.
This plant was described in the early 19th century by the prolific Scottish botanist, Robert Brown.