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*Kirstenbosch National Botanical Garden, South African National Biodiversity Institute, Private Bag X7, 7735 Claremont, Cape Town. **Sphaeroid Institute, 845 Mason Road, Vista, CA 92084.
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E.J. Van Jaarsveld andSteven Hammer "Tylecodon opelii, a new obligatory quartz-gravel species from the Northern Knersvlakte (Western Cape, South Africa)," Cactus and Succulent Journal 83(4), 140-145, (1 July 2011). https://doi.org/10.2985/0007-9367-83.4.140
E.J. Van Jaarsveld, Steven Hammer "Tylecodon opelii, a new obligatory quartz-gravel species from the Northern Knersvlakte (Western Cape, South Africa)," Cactus and Succulent Journal, 83(4), 140-145, (1 July 2011)
