Acacia microcalyx is a shrub belonging to the genus Acacia and the subgenus Phyllodineae that is endemic to western Australia.
Description
The densepungent shrub typically grows to a height of. It has ash-grey to pale greencoloured, rigid, erect to ascending branchlets that are generally straight and are sparingly divided with obscure ribs. Like most species of Acacia it has phyllodes rather than true leaves. The evergreen phyllodes are few and distant from each other with a linear shape and a length of and a width of and an obscure midrib. It blooms from February to June and produces cream flowers.