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frostweed, frost-weed, frostwort, Helianthemum canadense, Crocanthemum canadense | perennial of the eastern United States having early solitary yellow flowers followed by late petalless flowers; 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 ❲Helianthemum canadense❳ |