Any bushy plant used for making brooms, particularly shrubs with stiff bristle-like branches.
Compound: 'broom' (the cleaning tool and the plant it's made from) plus 'bush.' Describes plants like Scotch broom and Spanish broom.
Broom plants themselves were so economically important historically that the tool took the plant's name—brooms weren't made of bristles; they were made of actual broom shrubs bound together, and the plant is still called that.
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