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.