Sphaerolobium benetectum (Leguminosae: Mirbelieae), a new species from south-west Western Australia

A new species of Sphaerolobium Sm. that has been collected from three widely spaced locations in the extreme south-west of Western Australia is described and illustrated. Sphaerolobium benetectum R. Butcher is one of a group of species possessing a distinctly black-spotted calyx and is most closely related to S. drummondii Turcz. and S. validum R. Butcher ms. A key to the members of this group is provided.