It is a clump-forming herb with linear, grass-like leaves and pale violet tepals.

Patersonia graminea is a rhizome-forming herb that forms dense clumps.

[3] Patersonia graminea was first described in 1873 by George Bentham in Flora Australiensis, from specimens collected by James Drummond.

[6] Grass-leaved patersonia grows in heath and scrub on sandplains and granite outcrops from the coast of south-western Western Australia near the Murchison River to near Watheroo, in the Avon Wheatbelt, Geraldton Sandplains and Yalgoo biogeographic regions.

[3][2] Patersonia graminea is listed as "not threatened" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions.