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Answer: The watermeal, or Wolffia globosa, is the world’s smallest flowering plant. This bright green oval plant is roughly the size of a grain of rice and can be found all over the world.
The genus Wolffia, tiny rootless plants of the duckweed family (Lemnaceae) that float at the surface of quiet streams and ponds, is undisputedly the world’s smallest flowering plant. Depending on the species, each plant is shaped like a small green football with a flat or rounded top.
