bitterweed

noun
bit·ter·weed | \ˈbi-tər-ˌwēd \

Definition of bitterweed 

: any of several American plants containing a bitter substance: such as

a : either of two ragweeds:

(1) : a low-growing common ragweed (Ambrosia artemissiifolia)

(2) : horseweed

b : an annual yellow-flowered sneezeweed (Helenium amarum synonym H. tenuifolium)

c : an erect annual composite herb (Hymenoxys odorata) of the southwestern U.S. that has yellow flowers and is poisonous to livestock

First Known Use of bitterweed

1819, in the meaning defined above

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The first known use of bitterweed was in 1819

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