Abstract
Explanations are made for the choice of a neotype from Kurnell, Botany Bay, N.S.W., Australia. A new combination is made for G. microphylla from Australia (Queensland, New South Wales, Victoria, South Australia and Tasmania) and Norfolk Island. A new species, G. arenaria, is described from the East Kimberley District of Western Australia, and the Northern Territory. The three species are illustrated in detail. Keys are provided to distinguish these taxa from their allies.

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