Wiltshire, R.J.E.1 and Stace, H.M.2 (1Department of Plant Science, University of Tasmania, GPO Box 25255, Hobart, Tasmania 7001, 2Department of Botany, University of Western Australia, Nedlands, WA 6907) 1997. The cytotaxonomy of four Tasmanian genera of Proteaceae. Telopea 7(3): 181–185. New chromosome number determinations for Orites diversifolia (2n=28) and Cenarrhenes nitida (2n=26) correct prior reports. We confirm Agastachys odorata with 2n=26 and Bellendena montana with 2n=10. These data indicate that x=15 is absent from subfamily Grevillioideae and family Proteaceae, and x=14 is absent from tribe Conospermeeae of subfamily Proteoideae, but x=5 is confirmed in subfamily Bellendenoideae.