Eucalyptus sphaerocarpa is a tree that typically grows to a height of and forms a
lignotuber. It has rough, grey to brownish, stringy bark on the trunk and branches. Young plants and
coppice regrowth have stems that are square in cross-section and dull greyish green leaves that are paler on the lower surface, elliptic to lance-shaped, long and wide. Adult leaves are the same shade of green to greyish on both sides, lance-shaped to curved, long and wide, tapering to a
petiole long. The flower buds are arranged in leaf
axils in groups of seven, nine or eleven on a flattened, unbranched
peduncle long, the individual buds on
pedicels long. Mature buds are oval, long and wide with a conical
operculum. Flowering has been recorded in September and the flowers are white. The fruit is a woody, shortened spherical
capsule long and wide with the valves below rim level. ==Taxonomy and naming==