One of the mysteries of the English language finally explained.
Either of two Australian shrubs of the family Chenopodiaceae, Atriplex nummularia, used as fodder for sheep in dry areas, and (occasionally) Rhagodia parabolica.
Late 19th century. From old man + salt bush.
old man saltbush/ˌəʊl(d) ˌman ˈsɔːltbʊʃ//ˌəʊl(d) ˌman ˈsɒltbʊʃ/
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