Halgania cyanea, the rough halgania, is a subshrub species in the borage family Boraginaceae. It is endemic to Australia. It has a spreading habit, growing to between 20 cm and 40 cm high and around 60 cm wide. Leaves are 4 to 20 mm long and 20 to 40 mm wide and have appressed hairs on the upper surface and toothed edges. Deep blue (or rarely white) flowers appear in terminal inflorescences throughout the year. These are followed by drupes.