gumweed

from WordNet (r) 3.0 (2006)

gumweed
    n 1: any of various western American plants of the genus
         Grindelia having resinous leaves and stems formerly used
         medicinally; often poisonous to livestock [syn: {gumweed},
         {gum plant}, {tarweed}, {rosinweed}]

from The Collaborative International Dictionary of English v.0.48

gumweed \gumweed\ n.
   any of various Western American plants of the genus
   {Grindelia} having resinous leaves and stems formerly used
   medicinally; often poisonous to livestock.

   Syn: gum plant, tarweed, rosinweed, rosin-weed.
        [WordNet 1.5]

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