1. Jodrell Laboratory, Natural Capital and Plant Health Department, Royal Botanic Gardens, Kew, Richmond, Surrey, UK
2. School of Life Sciences, Pharmacy and Chemistry, Kingston University, London, UK
3. Herbier National, Institut National en Sciences Exactes et Naturelles, (IRSEN), Cité Scientifique de Brazzaville, Brazzaville, République du Congo
4. Identification and Naming Department, Herbarium, Royal Botanic Gardens, Richmond, Surrey, UK