By Karikari, S K, Mathew, I P, Onazi, O C
By Jasper N. Joiner
By Sue Minter, H.R.H. Duke of Edinburgh
By Gerd Krussmann, Michael E. Epp
By Wulf, Andrea
By Gerd Krussmann
By John Evelyn
By Natural History Museum
By arthur j. simons
By Anne Starling, Peter Loosley, Tessa Lovatt Smith
By James Soule
By G. R. Dixon
By Richard J. Chancellor
By John E. Preece, Paul Read
By John W. Mastalerz
By James B. Beard
By Roderick Floud
By P.J. Salter, J.K.A. Bleasdale
By Mike Dash
By Jonathan Edwards
By Alan Bloom
By Carol R. Peterson
By Fiona Davison
By D.O'D. Bourke, etc.
By Tim D. Davis, Bruce E. Haissig, Narendra Sankhla
By The European Garden Flora Editorial Committee (University of Cambridge Botanic Garden)
By C. Broertjes, A.M. van Harten