tarweed

noun

1. (countable, uncountable)Any of various American flowering plants that have sticky leaves.

   “Some of the weeds that cause an undesirable flavor in milk are: onion, tarweed, scaleweed, garlic, mustard, pepper grass.”

   “To this group belong feeds such as: Silage, alfalfa hay, turnips, kale, apples, potatoes, beet pulp, beet tops, rape, cabbage; and also weeds such as garlic, scaleweed, dog-fennel, tarweed, peppergrass, wild mustard, and others.”