blue bush
/ˈbluː ˌbʊʃ/noun
Any of several shrubs having leaves of a bluish colour; specifically (a) the South African shrub Diospyros lycioides (family Ebenaceae); (b) any of several plants native to arid areas of Australia, especially those of the Australian genus Maireana (family Amaranthaceae), and the perennial goosefoot Chenopodium auricomum.
Origin
Early 19th century; earliest use found in Edinburgh New Philosophical Journal. From blue + bush.