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Family!Scientific Name AuthorReferenceDate
Asteraceae  Silphium perfoliatum subsp. connatum (L.) CrudenCastanea 27(2): 901962
Asteraceae  Silphium perfoliatum var. connatum (L.) CronquistBrittonia 29(2): 2231977
Asteraceae  Silphium perfoliatum var. perfoliatum    
Asteraceae  Silphium perfoliatum fo. petiolatum E.J. Palmer & Steyerm.Brittonia 10(3): 1191958
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