3 responses to “Hollow Joe Pye Weed – Eupatoriadelphus fistulosus – Added to USWildflowers Database”

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  Keystone Flora August 20th, 2010 at 08:49

  Did they change the name of Eupatorium fistulosus? So many names have been changed, it is hard to keep up!

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  gcw August 20th, 2010 at 09:54

  USDA Plants Database has Eupatorium fistulosum and 2 other Eupatorium species reclassified into Eupatoriadelphus. However, I just checked ITIS, and while they have Eupatoriadelphus listed as an accepted genus, they don’t have any species included, and Eupatorium fistulosum is listed as “accepted.” Once again, it depends on which “authority” you follow. I’ll do a bit more research into the status and may have to change my classification to Eupatorium; I normally follow ITIS when it conflicts with USDA.

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  gcw August 20th, 2010 at 15:16

  While ITIS does not show Eupatorium fistulosum as the accepted name, both Missouri Botanical Gardens and Lady Bird Johnson Wildflower Center do recognize that as the new name replacing Eupatorium fistulosum. Wildflower Center says “The Joe-Pye Weeds have been assigned to the genus Eupatoriadelphus to separate them from the Bonesets (Eupatorium). Some sources still refer to this species as Eupatorium. The genus Eupatoriadelphus differs from the genus Eupatorium by whorled leaves, while Eupatorium has opposite leaves.” http://www.wildflower.org/plants/result.php?id_plant=eufi2

  So I guess I’ll stick with the Eupatoriadelphus classification.