rosinweed

Plural: rosinweeds

Noun

• North American perennial having a resinous odor and yellow flowers
• any of various western American plants of the genus Grindelia having resinous leaves and stems formerly used medicinally; often poisonous to livestock
• Any of various composite plants which secrete resins or have a resinous smell; for example, several species in the genus Silphium in the composite family.

Synonyms

gum plant, gumweed, Silphium laciniatum, tarweed