• WordNet 3.6
    • n tarweed any of various western American plants of the genus Grindelia having resinous leaves and stems formerly used medicinally; often poisonous to livestock
    • n tarweed any of various resinous glandular plants of the genus Madia; of western North and South America
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Webster's Revised Unabridged Dictionary
    • n Tarweed (Bot) A name given to several resinous-glandular composite plants of California, esp. to the species of Grindelia Hemizonia, and Madia.
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Century Dictionary and Cyclopedia
    • n tarweed A viscid rosaceous plant, Chamæbatia foliolosa, with feathery leaves and strawberry-like blossoms, abundant in California. It fills the air with a not very pleasant balsamic odor. Also called mountain misery and bear-clover.
    • n tarweed Any one of various glandular, viscid, and heavy-scented plants of the genus Madia, of the similar Hemizonia, or of Grindelia, otherwise called gum-plant.
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In literature:

The man made no reply, but spat carefully into the tarweed.
"The Rules of the Game" by Stewart Edward White
This is one of the most beautiful of all our tarweeds.
"The Wild Flowers of California: Their Names, Haunts, and Habits" by Mary Elizabeth Parsons