One of the mysteries of the English language finally explained.
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.
Early 19th century; earliest use found in Edinburgh New Philosophical Journal. From blue + bush.
blue bush/ˈbluː ˌbʊʃ/
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