| tarweed | (n) any of various resinous glandular plants of the genus Madia; of western North and South America |
| common madia | (n) California annual having red-brown spots near the base of its yellow flower rays, Syn. common tarweed, Madia elegans |
| 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 |
| melosa | (n) South American herb with sticky glandular foliage; source of madia oil, Syn. madia oil plant, Madia sativa, Chile tarweed |
| Tarweed | n. (Bot.) A name given to several resinous-glandular composite plants of California, esp. to the species of |