1. Seed Conservation Department, Royal Botanic Gardens, Kew, Wakehurst Place, West Sussex, RH17 6TN, UK
2. Kazan Institute of Biochemistry and Biophysics, Russian Academy of Sciences, PO Box 30, Kazan 420111, Russia
3. School of Biological and Conservation Sciences, University of KwaZulu‐Natal, Private Bag X01, Pietermaritzburg, Scottsville 3209, South Africa