Coleman, M. “1997 IUCN Red List of Threatened Plants. Edited by Kerry S. Walter and Harriet J. Gillett, Compiled by the World Conservation Monitoring Centre”. Edinburgh Journal of Botany 56, no. 2 (July 1, 1999): 309–310. Accessed September 15, 2026. https://journals.rbge.org.uk/ejb/article/view/998.