Webster's 1913 Dictionary
TARWEED
TARWEED Tar "weed `, n. (Bot. )
Defn: A name given to several resinous-glandular composite plants of California, esp. to the species of Grindelia, Hemizonia, and Madia.
New American Oxford Dictionary
tarweed
tar weed |ˈtärˌwēd ˈtɑrwid | ▶noun any of a number of American plants of the daisy family with sticky leaves and heavy scent. [Madia, Grindelia, Hemizonia, and related genera, family Compositae. ]
Oxford Dictionary
tarweed
tar |weed |ˈtɑːwiːd | ▶noun [ mass noun ] any of a number of American plants of the daisy family with sticky leaves and heavy scent. ●Madia, Grindelia, Hemizonia, and related genera, family Compositae.
The Wordsmith Dictionary