1) Griffith, Bryce, Omernick & Rodgers (2007). Ecoregions of Texas. 2) https://www.wildflower.org/plants/result.php?id_plant=AGHE4. 3) http://bonap.net/TDC/Image/Map?taxonType=Species&taxonId=16277&locationType=County&mapType=Normal. 4) https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=33027#null, 5) https://houstonaudubon.org/sanctuaries/bolivar-flats/bolivar/prairie-gerardia.html
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