Gold Medal -- awarded every six years (established 1987)
1987 Frans A. Stafleu (Utrecht)
1993 William T. Stearn (London)
Silver Medal -- awarded annually (but presented every three years, alternately at ICSEB and IBC, established 1990)
presented 1990:
1987 Natalie W. Uhl and John Dransfield (Cornell): "Genera palmarum"
1988 Elmar Robbrecht (Meise): "Tropical woody Rubiaceae"
1989 Peter Taylor (Kew): "The genus Utricularia"
presented 1993:
1990 Warren L. Wagner, D. R. Herbst & S. H. Sohmer (Ann Arbor): "Manual of the flowering plants of Hawaii"
1991 Rupert C. Barneby (New York): "Sensitivae censitae"
1992 Rudolf M. Schuster (Amherst): "Hepaticae and Anthocerotae of North America"
presented 1996:
1993 Donald J. McGillivray (Sydney): "Grevillea: Proteaceae. A taxonomic revision"
1994 Grady L. Webster (Davis): "Synopsis of the genera and suprageneric taxa of the Euphorbiaceae"
1995 Peter Boyce (Kew): "The genus Arum"
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Effective publication date: 13 August 1998
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