horseweed
noun
horse·weed
ˈhȯrs-ˌwēd
1
: a common annual American composite herb (Conyza canadensis synonym Erigeron canadensis) with an erect usually hairy stem and small discoid heads of yellow disk flowers
2
: a coarse annual North American ragweed (Ambrosia trifida)
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Merriam-Webster unabridged
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