Any of various shrubby plants with greasy or oily leaves or seeds, found in arid regions.
From 'grease' + 'bush'; the name refers to the waxy or oily texture of the plant's foliage or seed coating, which helps it retain moisture in dry climates.
Desert plants often develop waxy or oily coatings as a survival strategy—these greasy-seeming leaves actually reduce water loss by creating a protective barrier. The plant's name is perfectly functional botanical folk terminology!
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