horseweed

noun

horse·weed ˈhȯrs-ˌwēd

: 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

: a coarse annual North American ragweed (Ambrosia trifida)

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Other native plant enemies include sow thistle; dandelions, which spread clouds of seeds once their cheerful yellow flowers dry up; tall bulky horseweed; round-leaved cheeseweed; purslane; and spurge, which blanket the ground like thick green doilies. —

Los Angeles Times, 13 June 2022 But after glyphosate-resistant crops had a few years to grow, farmers began to notice horseweed and morning glory and other weeds encroaching once more into their fields. —

Carl Zimmer, Discover Magazine, 4 May 2010 Some examples are sharp point fluvellin, velvetleaf, puncturevine, horseweed, western bittercress and oxalis. —

OregonLive.com, 27 Feb. 2018 Yet tolerance to 2,4-D has already been documented in several weed species that have elsewhere become glyphosate-resistant superweeds, including waterhemp and horseweed. —

Brandon Keim, WIRED, 24 June 2014