Eucalyptus mimica is a mallet that typically grows to a height of and does not form a
lignotuber. It has smooth, shiny green bark that is copper-coloured when fresh. Adult leaves are the same shade of glossy green on both sides, held erect, linear to narrow elliptical, long and wide on a
petiole up to long. The flower buds are arranged in groups of three on an unbranched
peduncle long, the individual buds on
pedicels long. Mature buds are oval to spindle-shaped, long and wide with a conical to beaked
operculum. The fruit is a woody, conical
capsule with three or four ribs along the sides, long and wide with the valves near rim level or slightly protruding. This species is similar to
E. steedmanii but has smaller buds and fruit. ==Taxonomy==