yarrow : Idioms & Phrases
golden yarrow
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noun greyish woolly leafy perennial with branched stems ending in leafless stalks bearing golden-yellow flower heads; dry areas western North America
Eriophyllum lanatum.
WordNet
sneezeweed yarrow
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noun Eurasian herb having loose heads of button-shaped white flowers and long grey-green leaves that cause sneezing when powdered
Achillea ptarmica; sneezewort.