Accepted By:
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Al-Meshal, I. A., A. M. Ageel, N. S. Parmar & M. Tariq. 1985. Catha edulis (khat): use, abuse, and current status of scientific knowledge. Fitoterapia 56: 131–152.
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Flora of China Editorial Committee. 1988-2013. Flora of China (Checklist & Addendum). Unpaginated. In C. Y. Wu, P. H. Raven & D. Y. Hong (eds.) Fl. China. Science Press & Missouri Botanical Garden Press, Beijing & St. Louis.
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Gibbs Russell, G. E., W. G. M. Welman, E. Retief, K. L. Immelman, G. Germishuizen, B. J. Pienaar, M. Van Wyk & A. Nicholas. 1987. List of species of southern African plants. Mem. Bot. Surv. South Africa 2(1–2): 1–152(pt. 1), 1–270(pt. 2).
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Molina R., A. 1975. Enumeración de las plantas de Honduras. Ceiba 19(1): 1–118.
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