@book{bhlpg31085520, title = {1997 IUCN red list of threatened plants }, volume = {1997}, url = {https://www.biodiversitylibrary.org/page/31085520}, publisher = {}, author = {}, year = {1997}, pages = {Page 161}, } @book{bhlpg51373399, title = {Flora of Southern Africa : the Republic of South Africa, Basutoland, Swaziland and South West Africa }, volume = {v.33:pt.7:fasc.2 (1983)}, url = {https://www.biodiversitylibrary.org/page/51373399}, publisher = {Govt. Printer}, author = {Codd, L. E. W. }, year = {1983}, pages = {Page 26}, }