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Open-access, online, rapid taxonomy
ISSN: 2653-4649 (Online)

Australian Journal of 




Two new species and a new combination in the Western Australian Hibbertia glomerosa (Dilleniaceae) species group

K.R. Thiele & T.A. Hammer

Author details ⏷

K.R. Thiele [1*] & T.A. Hammer [2,3]

[1] School of Biological Sciences, University of Western Australia, 35 Stirling Hwy, Crawley, Western Australia, 6009
[2] State Herbarium of South Australia, Botanic Gardens and State Herbarium, Hackney Road, Adelaide, South
Australia 5000
[3] School of Biological Sciences, The University of Adelaide, Adelaide, South Australia 5005


The common and widespread Hibbertia glomerosa (Benth.) F.Muell. currently comprises two varieties, var. glomerosa and var. bistrata J.R.Wheeler. Field studies indicate that the latter is consistently different from the former, with no intermediates even when the two taxa grow in close proximity, and for this reason var. bistrata is here raised to species rank as H. bistrata (J.R.Wheeler) K.R.Thiele & T.Hammer. While assessing all material of H. glomerosa at the Western Australian Herbarium, two unusual specimens were found, each of which falls well outside the morphological range of either H. glomerosa or H. bistrata. Field visits to the locations of these specimens indicate that each comprises a distinct taxon, described here as H. leptophylla K.R.Thiele and H. dracolithica K.R.Thiele. The new species are almost certainly closely related to H. glomerosa, but differ consistently in leaf size and morphology, and, in the case of H. dracolithica, indumentum. They are likely to represent rare, narrow-range endemics.

Cite this paper as: Thiele KR & Hammer TA (2024). Two new species and a new combination in the Western Australian Hibbertia glomerosa (Dilleniaceae) species group. Australian Journal of Taxonomy 61: 1–5. doi:

This paper was published on: 17/4/2024





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