@book{bhlpg31085879, title = {1997 IUCN red list of threatened plants }, volume = {1997}, url = {https://www.biodiversitylibrary.org/page/31085879}, publisher = {}, author = {}, year = {1997}, pages = {Page 520}, } @book{bhlpg40576576, title = {Contributions from the United States National Herbarium }, volume = {v.55 (2007)}, url = {https://www.biodiversitylibrary.org/page/40576576}, publisher = {Smithsonian Institution Press}, author = {United States. National Herbarium. }, year = {2007}, pages = {Page 516}, } @book{bhlpg31558096, title = {The World List of Threatened Trees }, volume = {1998}, url = {https://www.biodiversitylibrary.org/page/31558096}, publisher = {}, author = {}, year = {1998}, pages = {Page 438}, }