1) Griffith, Bryce, Omernick & Rodgers (2007). Ecoregions of Texas. 2) Miller, George O., Landscaping with Native Plants of Texas 2nd Ed., 2013, pg 48. 3) Wasowski and Wasowski, Native Texas Plants Landscaping Region by Region, 1991, pg. 207. 4) https://www.wildflower.org/plants/result.php?id_plant=SACO5. 5) http://bonap.net/TDC/Image/Map?taxonType=Species&taxonId=13665&locationType=County&mapType=Normal, 6) https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=32682#null, 7) Native and Adapted Landscape Plants, City of Austin and Texas A&M, 2014.
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