Tetratheca rupicola

A shrub usually to 0.4 m high, spreading to about the same width. 

It is endemic to NSW, growing on the central tablelands / central coast divide; from as far north as Newnes State Forest, and south and east towards Kurrajong and most of the Blue Mountains (down to Blaxland), through the west of Lake Burragorang then around Robertson, Fitzroy Falls and Avon Dam (Note: it has a very similar distribution to T. rubioides, and also appears similar to this species. Hence, some records may be erroneous).

It is found in dry sclerophyll woodland and forest as well as rocky heathland, on sandstone substrate. 

In Tetratheca spp., leaves are simple and can be arranged alternately or in opposite pairs or whorls. Some species can exhibit varying leaf arrangements (dimorphic). In this species, leaves usually in whorls of 4 to 6; sometimes appearing in pairs of alternate or opposite leaves, or in whorls of 3 at the base of branches; to 15 mm long and 1.5 mm wide; linear with margins rolled down. 

Tetratheca spp. tend to produce solitary or paired flowers in leaf axils, well beyond the foliage. They typically have 4 petals which resemble an even cross (some flowers can have 5 petals), with 8 stamens and 1 carpel. Flowers often point downwards (pendent) which attracts certain insects. In this species, flowers are solitary, deep lilac-pink, to about 20 mm across, occurring mostly in October to December.

Tetratheca spp. produce fruit as capsules which open longitudinally. In this species, the capsules are to 7 mm long, ovate to oblong and beaked, and opening longitudinally; seeds about 4 mm long.