Any of various Western American plants of the genus Grindelia having resinous leaves and stems formerly used medicinally; often poisonous to livestock.(noun)
Gnu Collaboartive International Dictionary of English: licensed under The Code Project Open License (CPOL)
Use "gumweed" in a sentence
"The gummy feature is shared by many members of this genus and has given rise to the common name gumweed or resinweed as a collective term."
"For instance, there’s a flower here known to botanists as Grindelia squarrosa I had to look that up, but when you pick one of the small yellow blooms and it sticks to your fingers, you’ll understand why it’s commonly called gumweed."