presently described is monophyletic. A tentative arrangement of 32 of Armstrong's 42 species was also suggested: Group 1: Z. adenodonta, Z. baeuerlenii, Z. collina, Z. cytisoides; Group 2: Z. buxijugum, Z. caducibracteata, Z. formosa, Z. granulata, Z. littoralis, Z. parrisiae, Z. tuberculata, Z. verrucosa; Group 3: Z. fraseri, Z. odorifera; Group 4: Z. prostrata, Z. smithii; Group 5: Z. aspalathoides, Z. ingramii; Group 6: Z. adenophora, Z. furfuracea, Z. laxiflora; Group 7: Z. montana, Z. southwellii; Group 8: Z. covenyi, Z. murphyi, Z. odorifera, Z. robusta. Zieria citriodora, Z. arborescens, Z. minutiflora, Z. obcordata and Z. pilosa were not able to be resolved in this study. Distribution Plants in the genus Zieria are endemic to Australia, except for Zieria chevalieri, which is found in New Caledonia. Zierias occur in all Australian states except Western Australia. Species list The species described to date (October 2017) and listed by the Australian Plant Census are: Zieria actites Duretto & P.I.Forst. Zieria adenodonta (F.Muell.) J.A.Armstr. – Wollumbin zieria Zieria adenophora Blakely – Araluen zieria Zieria alata Duretto & P.I.Forst. Zieria arborescens Sims – stinkwood Zieria aspalathoides A.Cunn. ex Benth. – whorled zieria Zieria baeuerlenii J.A.Armstr. – Bomaderry zieria Zieria bifida Duretto & P.I.Forst. Zieria boolbunda Duretto & P.I.Forst. – Box Range zieria Zieria buxijugum J.D.Briggs & J.A.Armstr. Zieria caducibracteata J.A.Armstr. Zieria cephalophila Duretto & P.I.Forst. Zieria chevalieri Virot – endemic to New Caledonia Zieria citriodora J.A.Armstr. – lemon-scented zieria Zieria collina C.T.White – hill zieria Zieria compacta C.T.White Zieria covenyi J.A.Armstr. – Coveny's zieria Zieria cytisoides Sm. – downy zieria Zieria distans Duretto & P.I.Forst. Zieria eungellaensis Duretto & P.I.Forst. Zieria exsul Duretto & P.I.Forst. Zieria floydii J.A.Armstr. – Floyd's zieria Zieria formosa J.D.Briggs & J.A.Armstr. – shapely zieria Zieria fraseri Hook. Zieria furfuracea R.Br. ex Benth. Zieria graniticola J.A.Armstr. ex Duretto & P.I.Forst. Zieria granulata C.Moore ex Benth. – Illawarra zieria, hill zieria Zieria hindii J.A.Armstr. – Hind's zieria Zieria hydroscopica Duretto & P.I.Forst. Zieria inexpectata Duretto & P.I.Forst. Zieria ingramii J.A.Armstr – Keith's zieria Zieria insularis Duretto & P.I.Forst. Zieria involucrata R.Br. ex Benth. Zieria laevigata Bonpl. – smooth zieria, twiggy midge bush Zieria lasiocaulis – J.A.Armstr. Willi Willi zieria Zieria laxiflora (Benth.) Domin – wallum zieria Zieria littoralis J.A.Armstr. – dwarf zieria Zieria madida Duretto & P.I.Forst Zieria minutiflora Domin – twiggy zieria Zieria montana J.A.Armstr. Zieria murphyi Blakely – Murphy's zieria Zieria obcordata A.Cunn. – obcordate-leafed zieria Zieria obovata (C.T.White)