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
同义词：frost-weed??/??frostwort??/??Helianthemum canadense??/??Crocanthemum canadensei
tall perennial herb having clusters of white flowers; the eastern United States
同义词：Virginia crownbeard??/??frost-weed??/??Verbesina virginica
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