A Revision of the Genus Medicosma (Rutaceae)

Abstract

The genus Medicosma Hooker f., which has traditionally been considered to be monotypic and endemic to Australia, consists of 22 species. Six of these are endemic to eastern Australia, one is endemic to southern New Guinea and 15 are endemic to New Caledonia. The genus is described and its taxonomic history and relationships to other genera are discussed. The species are described, keyed and their relationships are outlined and discussed. Seventeen species are described as new, namely M. elliptica, M. obovata, M, glandulosa, M, diversifolia, M. articulata, M. parvifolia, M. obliqua, M. tahafeana, M. emarginata, M. verticillata, M. congests, M. latifolia, M. subsessilis, M. suberosa, M. petiolaris, M. exigua and M. gracilis, and new combinations are made for M. fareana (F. Mueller) T. Hartley, M. sessiliflora (C. T. White) T. Hartley, M. riparia (van Royen) T. Hartley and M. leratii (Guillaumin) T. Hartley.