Siberian wall flower

Siberian wallflower

noun
a North American plant, Erysimum asperum, of the mustard family, having orange-yellow flowers.

Origin:
1920–25

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
siberian wall flower

noun
showy erect biennial or short-lived perennial cultivated for its terminal racemes of orange-yellow flowers; sometimes placed in genus Cheiranthus 
WordNet® 3.0, © 2006 by Princeton University.
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