By DK
By Taiz, Lincoln, Zeiger, Eduardo
By Chris Hawes (Research School of Biological and Molecular Sciences, Research School of Biological and Molecular Sciences, Oxford Brookes University, Oxford), Beatrice Satiat-Jeunemaitre (, Institut des Sciences Vegetales, Gif-sur-Yvette, France)
By Richard Bird, National Trust Books
By Ary, S., Gregory, Mary, Nicholson, B. E.
By Michael Scott
By Keith R. West
By Roy Lancaster
By Jennifer Potter
By Georgianna Lane
By Michael Chinery
By Rose, Francis
By Jim Waller (CABI Egham, Surrey, UK), Jillian Lenne (Consultant in Agricultural Research and Development, UK and Editor in Chief, Field Crops Research), Sarah Waller
By DK, The Royal Botanic Gardens, Kew
By Lord Snowdon, Penny David, Roy Strong
By Welford, Mark, Wicks, Stephen
By Richard Mabey
By Heywood, V. H.
By Martyn Rix, Roger Phillips
By Bruce Schaffer, Peter C. Andersen
By Kerry F. Harris (Texas A&M University, College Station, U.S.A.), Oney P. Smith (Hood College, Frederick, Maryland, James E. Duffus (United States Department of Agriculture, Salinas, California)
By Mabey, Richard
By John Manning, Peter Goldblatt
By Dr Edward Bach
By Bridgette James
By Beverley Glover (Professor of Plant Systematics and Evolution, Professor of Plant Systematics and Evolution, Department of Plant Sciences, University of Cambridge)
By Jack Wallington
By Christopher Brickell
By Richard Bird
By Nikki Van De Car, Anna Godeassi