This first series of studies in the Cunoniaceae offers revisions of the genera Ceratopetalum Sm., Gillbeea F. Muell., Aistopetalum Schltr., and Calycomis D. Don. Full synonymy, bibliography, descriptions, and critical notes are given for the genera and species, and keys to the species are included. The genus Cemtopetalum comprises five species in eastern Australia and New Guinea. C. tetrapterum Mattf., described from New Guinea, is reduced in synonymy under C. succirubrum C. T. White, previously known only from northeastern Queensland. The genus Gillbeea comprises two species, one in north-eastern Queensland and one in New Guinea. The genus Aistopetalum comprises two species in New Guinea; one species is widespread in the northern parts of the island, the other is known only from the type collection. A. tetramerum Kan. et Hat. is reduced in synonymy under A. viticoides. The genus Calycomis is monotypic; its only species, C. australis (A. Cunn.) Hoogl. comb. nov. (Weinmannia australis A. Cunn.) is found in the Blue Mountains of New South Wales and is currently known as Acrophyllum verticillatum or A. venosum.
Grevillea laurifolia subsp. caleyana Olde (Proteaceae: Grevilleoideae: Hakeinae), a new subspecies from the Blue Mountains of New South Wales