Conostylis petrophiloides is a rhizomatous, tufted perennial, grass-like plant or herb in the family Haemodoraceae and is endemic to the south-west of Western Australia.

It has flat, glabrous leaves, and yellowish-cream coloured, tubular flowers.

Conostylis petrophiloides is a rhizomatous, perennial, grass-like plant or herb with tufts up to 50–100 mm (2.0–3.9 in) wide and short stems.

[2][3][4] Conostylis petrophiloides was first formally described in 1873 by George Bentham from an unpublished description by Ferdinand von Mueller, in his Flora Australiensis from specimens collected by Mueller near the Phillips River.

[6] This conostylis grows in sand in heath and mallee shrubland between Dowerin, the Stirling Range and Hopetoun in the Avon Wheatbelt, Coolgardie, Esperance Plains, Jarrah Forest and Mallee bioregions of south-western Western Australia.