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

[ Syn: frostweed , frostwort , helianthemum canadense , crocanthemum canadense ]

tall perennial herb having clusters of white flowers; the eastern United States

[ Syn: virginia crownbeard , frostweed , verbesina virginica ]