A sycamore tree, especially the American sycamore, named for its round seed ball that resembles a button.
Compound word from 'button' (round fastener) and 'ball,' referring to the distinctive spherical seed heads of plane trees.
The buttonball is also called the American sycamore or plane tree, and its spiky seed balls are actually brilliant evolutionary design—they break apart to scatter seeds on wind and water.
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