frost weed

frostweed

[frawst-weed, frost-]
noun
a plant, Helianthemum canadense, of the rockrose family, native to eastern North America, having narrow leaves and a solitary yellow flower.

Origin:
1830–40, Americanism; frost + weed1; so called from the ice crystals which form on it during the first frosts

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

noun
1. perennial of the eastern United States having early solitary yellow flowers followed by late petalless flowers; so-called because ice crystals form on it during first frosts 
2. tall perennial herb having clusters of white flowers; the eastern United States [syn: Virginia crownbeard
WordNet® 3.0, © 2006 by Princeton University.
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