By Karikari, S K, Mathew, I P, Onazi, O C
By G. R. Dixon
By P.H. Li
By Agriculture, Fish.& Food, Min.of
By Ian G. Walls
By Jasper N. Joiner
By Anne Starling, Peter Loosley, Tessa Lovatt Smith
By arthur j. simons
By Natural History Museum
By Wulf, Andrea
By Pete Brown
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
By Sue Minter, H.R.H. Duke of Edinburgh
By Alan Major
By John Evelyn