'frost-weed' definitions:

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, frost-weed, frostwort, Helianthemum canadense, Crocanthemum canadense]

Tall perennial herb having clusters of white flowers; the eastern United States [syn: Virginia crownbeard, frostweed, frost-weed, Verbesina virginica]