bullweed

Noun

bullweed (countable and uncountable, plural bullweeds)

1. Knapweed.
   • For this reason it is most excellent practice to mow the weeds of Lambsquarter, Ragweed, Hog Ragweed, Bullweed, Artichoke, and in fact all other weeds large enough to sustain such borers – mowing them about the middle of the summer and again the latter part of August.1906, Pennsylvania. Department of Agriculture., The Monthly Bulletin of the Division of Zoology, page 116
   • Along the narrow creekstone roads, the winter landscape is etched in myriad shades of brown — sedge grass and bullweed stalks, barren trees on a carpet of fallen leaves, decaying shells of unpainted houses staring blankly through vacant windows.1974, John Egerton, The Americanization of Dixie: the Southernization of America, page 67