rosinweed

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various North American plants in the composite family that exude resinous secretions, especially those of the genus Silphium, such as the compass plant.

from The Century Dictionary.

• noun Any plant of the genus Silphium; especially, S. laciniatum. See compass-plant, 1, and prairie burdock (under burdock).

from the GNU version of the Collaborative International Dictionary of English.

• noun The compass plant. See under compass.
• noun A name given in California to various composite plants which secrete resins or have a resinous smell.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The compass plant.
• noun US, California Any of various composite plants which secrete resins or have a resinous smell.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun North American perennial having a resinous odor and yellow flowers
• noun any of various western American plants of the genus Grindelia having resinous leaves and stems formerly used medicinally; often poisonous to livestock