John E. Burrows. Buffelskloof Nature Reserve Herbarium (BNRH). John E. Burrows. Year: 2014. Contact: botartburrows@gmail.com.
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Cam Webb, Endro Setiawan & Hery Yanto. Arnold Arboretum of Harvard University. Cam Webb, Endro Setiawan & Hery Yanto. Year: 2015. Contact: cw@camwebb.info.
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