1) Griffith, Bryce, Omernick & Rodgers (2007). Ecoregions of Texas. 2) Miller, George O., Landscaping with Native Plants of Texas 2nd Ed., 2013, pg 52. 3) https://www.wildflower.org/plants/result.php?id_plant=VEVI3. 4) https://portal.torcherbaria.org/portal/taxa/index.php?taxon=Verbesina+virginica&formsubmit=Search+Terms. 5) http://bonap.net/TDC/Image/Map?taxonType=Species&taxonId=4736&locationType=County&mapType=Normal, 6) https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=38613#null, 7) Native and Adapted Landscape Plants, City of Austin and Texas A&M, 2014.
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