Any of various weedy plants that resemble broom or grow among broom plants, especially certain herbaceous species.
From broom + weed (Old English 'weod', a wild plant). Compounds plant names by combining common plant types.
Plant naming reveals how people learned botany—they'd describe new plants by comparing them to familiar ones, so 'broomweed' means 'that weed that looks like broom,' creating an entire vocabulary of comparative plant identification.
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