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Any coarse weed of the genus Xanthium having spiny burrs.

1
Some find their sheets strewed with chaff or cockle-burs, some find no sheets at all.
Lippincott's Magazine of Popular Literature and Science, Volume ...
2
He was a mass of cockle-burs.
Crooked Trails
3
They render the farmer great service, by eating the cockle-burs which grow on the rich alluvial soil of Carolina.
The Western World / Picturesque Sketches of Nature and Natural H...