Calothamnus torulosus is a plant in the myrtle family, Myrtaceae and is endemic to the south-west of Western Australia.

[2] They have 4 petals and 4 claw-like bundles of stamens with the upper 2 claws broad and flat, sometimes joined for part of their length.

[6] Calothamnus torulosus was first formally described by Johannes Schauer in 1843 in ''Dissertatio phytographica de Regelia, Beaufortia et Calothamno from a specimen collected "at the top of the hill at the foot of the mountains of the Darling Range, not far from the town Maddington", now a suburb of Perth.

[7] The specific epithet is derived from the Latin word torosus, meaning "bulging, muscular, fleshy or lusty".

[8] Calothamnus torulosus occurs from Perth to Eneabba[5] in the Geraldton Sandplains, Jarrah Forest and Swan Coastal Plain biogeographic regions,[4] where it grows on sand and rocky soils derived from granite.