rosinweed

from WordNet (r) 3.0 (2006)

rosinweed
    n 1: North American perennial having a resinous odor and yellow
         flowers [syn: {rosinweed}, {Silphium laciniatum}]
    2: 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

Rosinweed \Ros"in*weed`\, n. (Bot.)
   (a) The compass plant. See under {Compass}.
   (b) A name given in California to various composite plants
       which secrete resins or have a resinous smell.
       [1913 Webster]