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

Conostylis teretifolia is a rhizomatous, tufted perennial, grass-like plant or herb that typically grows to 6–20 cm (2.4–7.9 in) high.

[2][3][4] Conostylis teretifolia was first formally described in 1961 by John Green in the Proceedings of the Linnean Society of New South Wales from a specimen collected by William Blackall near Cockleshell Gully in 1938.

[6] In 1987, Stephen Hopper described two subspecies of C. teretifolia in the Flora of Australia and the names are accepted by the Australian Plant Census: This species of conostylis grows in sand and sandy loam.

Subspecies planescens occurs in isolated sites between Gingin, Yanchep and Wanneroo in the Geraldton Sandplains, Jarrah Forest, Swan Coastal Plain bioregions of south-western Western Australia,[8][11] and subsp.