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
   - gumweed, gum plant, rosinweed

Derived forms: tarweeds

Type of: herb, herbaceous plant

Part of: genus Grindelia, genus Madia, Grindelia, Madia

Encyclopedia: Tarweed

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