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nounany of various western American plants of the genus Grindelia having resinous leaves and stems formerly used medicinally; often poisonous to livestocktype of:
Definition that contains gumweed
- grindelia robusta perennial gumweed of California and Baja California
- grindelia squarrosa perennial gumweed of western and central North America
- curlycup gumweed perennial gumweed of western and central North America