Dendrobium speciosum

Dendrobium speciosum, commonly known as the rock orchid or cane orchid is a species of highly variable Australian orchid. Its varieties can be found in a range of habitats as epiphytes (on branches or trunks of trees) or lithophytes. It has a continuous distribution along the east coast of Australia and distinct populations along the Tropic of Capricorn. As a lithophyte, it forms gigantic spreading colonies on rocks and cliff faces, often exposed to full sun, with its roots forming dense, matted beds across the rock that anchor the plant. It can be found at altitudes from sea level to 900 metres. 

The flowers vary in colour from white to bright yellows and flowering tends to occur between August and November depending on location and conditions, and may happen bi-annually.