FROSTWORT
\fɹˈɒstwɔːt], \fɹˈɒstwɔːt], \f_ɹ_ˈɒ_s_t_w_ɔː_t]\
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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
By Princeton University