musk thistle

noun
a composite plant, Carduus nutans, having heads of nodding, rose-purple flowers, introduced into the U.S. from Eurasia.

Origin:
1725–35

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

noun
Eurasian perennial naturalized in eastern North America having very spiny white cottony foliage and nodding musky crimson flower heads; valuable source of nectar 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
In many areas it has significantly reduced the density of musk thistle.
Scotch thistle differs from musk thistle in the upright flower heads and the leafy stems below the flower heads.
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