Hibbertia hemignosta is a species of flowering plant in the family Dilleniaceae and is endemic to the south-west of Western Australia. It is a prostrate to erect shrub that typically grows to a height of . It was first formally described in 1845 by Ernst Gottlieb von Steudel who gave it the name Pleurandra hemignosta in Lehmann's Plantae Preissianae.[1] [2] In 2002, Judy Wheeler changed the name to Hibbertia hemignosta in Journal of the Adelaide Botanic Gardens.[3] The specific epithet (hemignosta) means "half-known", but the reason for that name was not given.[4] This hibbertia grows on sandplains, flats and slopes in the Avon Wheatbelt, Coolgardie, Esperance Plains, Jarrah Forest, Mallee, Swan Coastal Plain and Warren biogeographic regions in the south-west of Western Australia.
Hibbertia hemignosta is classified as "not threatened" by the Government of Western Australia Department of Parks and Wildlife.