Any of various plants with button-like flowers or seed structures, particularly in the Diodia or Spermacoce genus.
Compound of 'button' and 'weed,' where 'weed' refers to wild plants, named for the round flower clusters.
Buttonweed proves that 'weed' is often just a plant in the wrong place—what botanists call Diodia is what farmers cursed as buttonweed choking their fields, yet it's actually valuable for erosion control.
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