Rhadinothamnus rudis is a small shrub with needle-shaped, angular branchlets and single white flowers at the end of branches.

Rhadinothamnus rudis is a shrub to 1.5 m (4 ft 11 in) high with terete, angular branchlets.

The fruit is a capsule about 5 mm (0.20 in) high, almost smooth, either with a short triangular point or with a blunt beak.

[2][3] This species was first formally described in 1845 by Friedrich Gottlieb Bartling and he gave it the name Phebalium rude, the description was published in Lehmann'sPlantae Preissianae.

[6][7] There are three subspecies described by Paul Wilson and accepted by the Australian Plant Census: Rhadinothamnus rudis is found growing on hills and plains in clay, sand, rocky soils, limestone, laterite and quartzite from Albany to Esperance on the south coast of Western Australia.