Radford, E. et al. 2003. The Management of ’Ad Hoc’ Ex Situ Conservation Status Species at the Royal Botanic Garden Edinburgh :: A Review of Options. Sibbaldia: the International Journal of Botanic Garden Horticulture. 1 (Oct. 2003), 43–80. DOI:https://doi.org/10.24823/Sibbaldia.2003.155.