What is the meaning of the word "xanthium"?

Definitions:

  1. A genus of coarse rough, or spiny herbs with small greenish flowers, native to the Americas, eastern Asia, and some parts of south Asia, and is commonly found as a weed in North America. copy to clipboard NOUN
  2. A genus of flowering plants in the Asteraceae family, commonly known as 'cockleburs' copy to clipboard NOUN

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