@book{bhlpg31085979, title = {1997 IUCN red list of threatened plants }, volume = {1997}, url = {https://www.biodiversitylibrary.org/page/31085979}, publisher = {}, author = {}, year = {1997}, pages = {Page 620}, } @book{bhlpg31190282, title = {Global Biodiversity: status of the Earth's living resources }, volume = {1992}, url = {https://www.biodiversitylibrary.org/page/31190282}, publisher = {}, author = {}, year = {1992}, pages = {Page 215}, }