Philotheca trachyphylla, commonly known as rock wax-flower,[2] is a species of plant in the family Rutaceae and is endemic to south-eastern Australia.

It is a shrub or small tree with glandular-warty, oblong to narrow egg-shaped leaves and white flowers arranged singly or in twos or threes, in leaf axils.

[2][3][4] Rock wax-flower was formally described in 1855 by Victorian Government Botanist Ferdinand von Mueller who gave it the name Eriostemon trachyphyllus and published the description in his book, Definitions of rare or hithertoo undescribed Australian Plants.

[5][6] In 1998, Paul Wilson changed the name to Philotheca trachyphylla in the journal Nuytsia.

[7][8] Philotheca trachyphylla occurs on hillsides and in gullies within forests in New South Wales and Victoria.