tar-weed

tarweed

[tahr-weed]
noun
any of several resinous or gummy, composite plants of the genus Grindelia, having solitary flower heads.

Origin:
1865–70, Americanism; tar1 + weed1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
tarweed

noun
1. any of various resinous glandular plants of the genus Madia; of western North and South America 
2. any of various western American plants of the genus Grindelia having resinous leaves and stems formerly used medicinally; often poisonous to livestock [syn: gumweed
WordNet® 3.0, © 2006 by Princeton University.
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