@book{bhlpg31085716, title = {1997 IUCN red list of threatened plants }, volume = {1997}, url = {https://www.biodiversitylibrary.org/page/31085716}, publisher = {}, author = {}, year = {1997}, pages = {Page 357}, } @book{bhlpg41650726, title = {Journal of the Botanical Research Institute of Texas }, volume = {v.2:no.1(2008)}, url = {https://www.biodiversitylibrary.org/page/41650726}, publisher = {Botanical Research Institute of Texas}, author = {Botanical Research Institute of Texas. }, year = {2008}, pages = {Page 718}, } @book{bhlpg41535979, title = {Journal of the Botanical Research Institute of Texas }, volume = {v.3:no.1(2009)}, url = {https://www.biodiversitylibrary.org/page/41535979}, publisher = {Botanical Research Institute of Texas}, author = {Botanical Research Institute of Texas. }, year = {2009}, pages = {Page 430}, }