frost-weed
Noun
Meaning
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
tall perennial herb having clusters of white flowers; the eastern United States
Source: WordNetSynonyms
frostweed
frostwort
Crocanthemum canadense
Helianthemum canadense
virginia crownbeard
verbesina virginica