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.

synoniemen: Crocanthemum canadense, frostweed, frostwort, Helianthemum canadense.

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

synoniemen: frostweed, Verbesina virginica, Virginia crownbeard.