Zanthoxylum brachyacanthum, known as thorny yellow-wood, satinwood, satin tree or scrub mulga,[2] is a species of flowering plant in the family Rutaceae and is endemic to north-eastern Australia.

It is a rainforest shrub or tree with thick, cone-shaped spines on the trunk and prickles on the branches, pinnate leaves, and male and female flowers arranged in panicles.

Flowering occurs from September to November and the fruit is a shiny bright red, later wrinkled dark brown, spherical or oval follicle 7–8 mm (0.28–0.31 in) long containing a single black seed.

[2][3][4][5] Zanthoxylum brachyacanthum was first formally described in 1857 by Ferdinand von Mueller in Transactions of the Philosophical Institute of Victoria from specimens collected in "the Araucaria forests of Moreton Bay".

This tree's small size, the interesting trunk, the attractive flowers and foliage makes the thorny yellowwood a candidate ornamental plant.