Often poisonous to livestock

• Any of various western American plants of the genus Grindelia having resinous leaves and stems formerly used medicinally
• North American perennial having a resinous odor and yellow flowers

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Rosinweed \Ros"in*weed`\, n. (Bot.) The compass plant. See under Compass . A name given in California to various composite plants which secrete resins or have a resinous smell.

WordNet Word definitions in WordNet
n. North American perennial having a resinous odor and yellow flowers [syn: Silphium laciniatum ] any of various western American plants of the genus Grindelia having resinous leaves and stems formerly used medicinally; often poisonous to livestock [syn: ...

Wiktionary Word definitions in Wiktionary
n. 1 The compass plant. 2 (context US California English) Any of various composite plants which secrete resins or have a resinous smell.