Seorsus, a new Gondwanan genus of Myrtaceae with a disjunct distribution in Borneo and Australia
RYE, B.L. AND TRUDGEN, MALCOLM E.
The new genus Seorsus Rye & Trudgen (Myrtaceae tribe Chamelaucieae) has four species, two in Borneo and one each in the north of the Northern Territory and the south-west of Western Australia. Seorsus is distinguished from related genera by the shape of its anther connective, the orientation of its anther loculi and its distinctly facetted seeds. Two of its four species were previously placed in Astartea DC., a third in Baeckea L. and the fourth is the new species Seorsus aequatorius Rye & Trudgen. Three new combinations, S. clavifolius (C.A.Gardner) Rye & Trudgen, S. intratropicus (F.Muell.) Rye & Trudgen and S. taxifolius (Merr.) Rye & Trudgen, are made. The morphological characteristics, Gondwanan distribution and relationships of the new genus are discussed. Descriptions, keys, illustrations and distribution maps are provided.
