American Journal of Plant Sciences, 2017, 8, 1774-1789 http://www.scirp.org/journal/ajps ISSN Online: 2158-2750 ISSN Print: 2158-2742 Emergence of Plastidial Intergenic Spacers as Suitable DNA Barcodes for Arid Medicinal Plant Rhazya stricta Samia A. Khan 1 , Mohammed N. Baeshen 2 , Hassan A. Ramadan 1,3,4 , Nabih A. Baeshen 1 Abstract Keywords DOI: 10.4236/ajps.2017.88121 July 3, 2017