 It is possible that it is an ancestor of "B. marginata", although "B. marginata" must have speciated well before the extinction of "B. kingii", given how widely it is now distributed.Extinction of "B. kingii" probably occurred in the late Quaternary, and may have been caused by the climatic and physical disruption of glaciation, or by increased fire frequency due to human activity.A formal description of "B. kingii" was published in 1991 by Gregory J. Jordan and Robert S. Hill, who named the species in honour of the discoverer, Deny King.