frost-weed
n. 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：frostweedfrostwortHelianthemum canadenseCrocanthemum canadensei
tall perennial herb having clusters of white flowers; the eastern United States 同义词：Virginia crownbeardfrostweedVerbesina virginica