Description: Eupatorium fistulosum, Baseline Barrens, Washington County, Indiana, 7 Aug 2010. Date: 7 August 2010, 11:47. Source: Eupatorium fistulosum. Author: Patrick Alexander from Las Cruces, NM.
Description: English: Stem of Joe Pye weed (Eutrochium fistulosum) showing the fistula or hollow from which the plant takes its latin name. The hollow is lined with pith and higher in the stem (shown to the right) the pith completely fills the stem. The plant was collected in Iowa City, Iowa and photographed the same day. Date: 16 July 2014, 18:51:20. Source: Own work. Author: Douglas W. Jones.
Description: Eupatorium fistulosum, Baseline Barrens, Washington County, Indiana, 7 Aug 2010. Date: 7 August 2010, 11:47. Source: Eupatorium fistulosum. Author: Patrick Alexander from Las Cruces, NM.