any of several resinous or gummy, composite plants of the genus Grindelia, having solitary flower heads.

1865–70, Americanism; tar1 + weed1

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Encyclopedia Britannica


any sticky, hairy plant of the genus Madia of the family Asteraceae, consisting of about 18 species. They are native to western North and South America.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Large areas were burned after dusk to clean out the sticky tarweed, leaving the seedpods roasted and accessible for collection.
Invasive yellow starthistles and tarweed abound in late summer.
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