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A new species, Indigofera centralis Peter G. Wilson & Rowe, is described from Central Australia, west of the Finke Gorge National Park in the Northern Territory; it resembles some other inland species (I. fractiflexa, I. gilesii, I. warburtonensis and I. helmsii) but differs most conspicuously by the relatively larger flowers.

Two additional species in the Indigofera haplophylla are described. Indigofera brennanii Peter G. Wilson, is a recently discovered taxon that occurs on Groote Eylandt and in Limmen National Park on the adjacent mainland. Indigofera fimbriolata Peter G. Wilson is a geographically isolated species that occurs in Bulleringa National Park, Queensland; it was formerly included in I. rupicola. Although both taxa are found in national parks, their conservation status has not been assessed.

The application of the name Indigofera monophylla is clarified by reference to the type held in the Geneva herbarium and an revised description provided. The name has been widely applied to plants with rounded, unifoliolate leaves and some workers have suggested that there are multiple species within this broadly defined group. One of these has previously been given the phrase name Indigofera sp. Bungaroo Creek (S. van Leeuwen 4301) and this is formally named here as Indigofera rivularis Peter G. Wilson. Two additional species in this complex are also described: Indigofera deserticola Peter G. Wilson & Rowe, is a species of sandplains occurring within the Great Sandy Desert and Dampierland Bioregions, and Indigofera rotula Peter G. Wilson, which is a species with smaller leaves and flowers that occurs primarily in areas south of the Pilbara. A key to these species is provided.

Typification of seven species and two varieties in Indigofera is considered. All relevant specimens are discussed and lectotypes designated for seven taxa, including five currently accepted species. Typification is clarified for a further two names.

Two new species of Indigofera are described from western Queensland, one of which also extends into the Northern Territory. Indigofera erubescens Peter G. Wilson & Rowe, is a species sometimes confused with I. brevidens and, to a lesser extent, I. helmsii but readily distinguished from both by its rather small, red flowers; Indigofera queenslandica Peter G. Wilson & Rowe, is a species superficially similar in parts of its range to I. leucotricha in having a rather dense, greyish indumentum. Both species are illustrated and their conservation status discussed.

The two varieties of Indigofera pratensis described by Karel Domin are reassessed. Indigofera pratensis var. coriacea is distinct from the widespread Indigofera pratensis sens. str. in a number of reproductive and vegetative characters and is here raised to specific rank as Indigofera scabrella. Indigofera pratensis var. angustifoliola is judged to be an environmental or rare geographic variant of Indigofera pratensis sens. str. and not worthy of continued recognition. Lectotypes are designated for both names.

Indigofera schrirei is proposed as a replacement name for I. torulosa Hook. & Arn. because the latter is a later homonym of I. torulosa E. Mey.