tarweed

/ˈtɑrˌwid/

Definitions of tarweed

1. noun

   any of various resinous glandular plants of the genus Madia; of western North and South America
   types:

   Chile tarweed, Madia sativa, madia oil plant, melosa

   South American herb with sticky glandular foliage; source of madia oil

   type of:

   herb, herbaceous plant

   a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests
2. noun

   any of various western American plants of the genus Grindelia having resinous leaves and stems formerly used medicinally; often poisonous to livestock
   synonyms: gum plant, gumweed, rosinweed

   types:

   Grindelia robusta

   perennial gumweed of California and Baja California

   Grindelia squarrosa, curlycup gumweed

   perennial gumweed of western and central North America

   type of:

   herb, herbaceous plant

   a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests