The Friesner Herbarium
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Silphium perfoliatum
Cup Plant
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Additional Resources
IPA LINK:
http://www.indiana.plantatlas.usf.edu/Plant.aspx?id=1834
CONSORTIUM LINK:
https://midwestherbaria.org/portal/taxa/index.php?taxon=Silphium+perfoliatum&formsubmit=Search+Terms
USDA LINK:
http://plants.sc.egov.usda.gov/core/profile?symbol=SIPE2