bull thistle

noun
a tall, spiny thistle, Cirsium vulgare, having heads of pink to purple flowers: a common weed in North America.

Origin:
1860–65

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
bull thistle

noun
European thistle with rather large heads and prickly leaves; extensively naturalized as a weed in the United States 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
Bull thistle is a biennial that reproduces solely by seed.
Also included are two county option weeds: multi-flora rose and bull thistle.
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