New Australian Taxa

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ISSN: 2200-####

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Hibbertia arenaria (Dilleniaceae), a new species from south-western Western Australia

K.R. Thiele

School of Biological Sciences, University of Western Australia, 35 Stirling Hwy, Crawley WA 6009

Western Australian Herbarium, Biodiversity and Conservation Science, Department of Biodiversity, Conservation and Attractions, Locked Bag 104, Bentley Delivery Centre, Western Australia 6983


The new species Hibbertia arenaria K.R.Thiele sp. nov., comprising specimens formerly ascribed to H. aff. axillibarba J.R.Wheeler, is described. Hibbertia aranaria is restricted to sandplain habitats in the general vicinity of South Ironcap, on which H. axillibarba is endemic; the two species are clearly morphologically distinct.


Hibbertia axillibarba J.R.Wheeler was described based on four specimens, all from the summit and upper slopes of South Ironcap, a banded ironstone hill c. 40 km north of Lake King (Wheeler, 2000). Since publication, three further specimens have been collected, all from South Ironcap.


Four Hibbertia specimens collected from sandplains in the vicinity of South Ironcap were placed at the Western Australian Herbarium in H. aff. axillibarba. These constitute a species distinct from H. axillibarba, described here as H. arenaria.

Materials & Methods



Spider caption


Swainsona hammeri



I thank Francis Nge and Suzanne Prober for help during field work, Michael Hislop and Rob Davis from the Western Australian Herbarium for useful discussions on this and related Hibbertia species, and the DIrector and staff of the Western Australian Herbarium for access to material.

Supplementary Material


Horn, J.W. (2005). The phylogenetics and structural botany of Dilleniaceae and Hibbertia Andrews. (PhD thesis: Duke University.)


Smith, M.G. & Jones, A. (2018). Threatened and Priority Flora list 5 December 2018. Department of Biodiversity,


Conservation and Attractions. [accessed 17 June 2018].


Wheeler, J.R. (2000). Review of Hibbertia mucronata and its allies (Dilleniaceae). Nuytsia 13(2): 379–394.

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