horseweed

[hawrs-weed]
noun
1.
a North American composite weed, Erigeron canadensis, having narrow, hairy leaves and clusters of very small greenish-white flowers.
3.
any of various other common weeds with small yellow flowers.

Origin:
1780–90, Americanism; horse + weed1

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Collins
World English Dictionary
horseweed (ˈhɔːsˌwiːd)
 
n
See fleabane the US name for Canadian fleabane

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Aggressive annual weeds such as ragweed, horseweed, and fireweed were identified and cut before setting seed.
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