Noun tarweed has 2 senses
  1. tarweed - any of various resinous glandular plants of the genus Madia; of western North and South America
    --1 is a kind of
    herb, herbaceous plant
    --1 is a member of Madia, genus Madia
    --1 has particulars: melosa, Chile tarweed, madia oil plant, Madia sativa
  2. gumweed, gum plant, tarweed, rosinweed - any of various western American plants of the genus Grindelia having resinous leaves and stems formerly used medicinally; often poisonous to livestock
    --2 is a kind of herb, herbaceous plant
    --2 is a member of Grindelia, genus Grindelia
    --2 has particulars: Grindelia robusta; curlycup gumweed, Grindelia squarrosa
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