Hibbertia advena (Dilleniaceae), a new and rare species from Queensland with transcontinental affinities

The new species Hibbertia advena T.Hammer & Toelken is described. It occurs in north-east Queensland but shares a strong morphological affinity with members of the H. exasperata (Steud.) Briq. species group, which are widespread in south-west Western Australia. This may be an example of a very wide transcontinental disjunction in Australian Hibbertia. The biogeographic significance of such disjunctions is briefly discussed, pending further insights when a more complete molecular phylogeny of the genus is generated.T.A. Hammer, H.R. Toelken, K.R. Thiel

Uncovering the correct publication date, spelling and attribution for the basionym of Hibbertia subg. Hemistemma (Dilleniaceae)

First published: 05 April 2022The complex publication history of Hibbertia subg. Hemistemma (Juss. ex Thouars) J.W.Horn is discussed, in particular the different editions of Du Petit-Thouars’s books on the plants of Madagascar, and it is concluded that the basionym Hemistemma Juss. ex Thouars was published in 1806 with that spelling and authorship. A type is designated for the name as well as for the synonym Pleurandra Labill.Jürgen Kellermann, Timothy A. Hammer, Hellmut R. Toelke