rosinweed

From rosin +‎ weed.

rosinweed (countable and uncountable, plural rosinweeds)

1. 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.

• “rosinweed”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.

• ironweeds