A plant with burrs or seed pods resembling buttons, or any of various plants producing button-like seed structures.
Compound of 'button' and 'bur' (from Old English 'byrce'), the prickly seed case of certain plants that stick to clothing and fur.
Burs and buttons seem opposite, but they're both nature's packaging solutions—burs stick aggressively while buttons close gently, yet both evolved to solve the problem of securing things together.
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